Upgrade fonttools to 4.10.0

Test: None
Change-Id: I7a2c428ddeec73630fe798578cdcb6494d594f73

25 files changed, 2711 insertions, 1068 deletions

diff --git a/Tests/designspaceLib/designspace_test.py b/Tests/designspaceLib/designspace_test.py
index 378effe6..f883730f 100644
--- a/Tests/designspaceLib/designspace_test.py
+++ b/Tests/designspaceLib/designspace_test.py
@@ -996,23 +996,30 @@ def test_addInstanceDescriptor():
     assert instance.styleMapStyleName == "regular"
 
 
-def test_addRuleDescriptor():
+def test_addRuleDescriptor(tmp_path):
     ds = DesignSpaceDocument()
 
     rule = ds.addRuleDescriptor(
-      name="TestRule",
-      conditionSets=[
-          dict(name='Weight', minimum=100, maximum=200),
-          dict(name='Weight', minimum=700, maximum=900),
-      ],
-      subs=[("a", "a.alt")],
+        name="TestRule",
+        conditionSets=[
+            [
+                dict(name="Weight", minimum=100, maximum=200),
+                dict(name="Weight", minimum=700, maximum=900),
+            ]
+        ],
+        subs=[("a", "a.alt")],
     )
 
     assert ds.rules[0] is rule
     assert isinstance(rule, RuleDescriptor)
     assert rule.name == "TestRule"
     assert rule.conditionSets == [
-        dict(name='Weight', minimum=100, maximum=200),
-        dict(name='Weight', minimum=700, maximum=900),
+        [
+            dict(name="Weight", minimum=100, maximum=200),
+            dict(name="Weight", minimum=700, maximum=900),
+        ]
     ]
     assert rule.subs == [("a", "a.alt")]
+
+    # Test it doesn't crash.
+    ds.write(tmp_path / "test.designspace")
diff --git a/Tests/feaLib/builder_test.py b/Tests/feaLib/builder_test.py
index 5ce4cc26..f2f1c05d 100644
--- a/Tests/feaLib/builder_test.py
+++ b/Tests/feaLib/builder_test.py
@@ -71,7 +71,8 @@ class BuilderTest(unittest.TestCase):
         ZeroValue_ChainSinglePos_horizontal ZeroValue_ChainSinglePos_vertical
         PairPosSubtable ChainSubstSubtable ChainPosSubtable LigatureSubtable
         AlternateSubtable MultipleSubstSubtable SingleSubstSubtable
-        aalt_chain_contextual_subst AlternateChained
+        aalt_chain_contextual_subst AlternateChained MultipleLookupsPerGlyph
+        MultipleLookupsPerGlyph2
     """.split()
 
     def __init__(self, methodName):
diff --git a/Tests/feaLib/data/MultipleLookupsPerGlyph.fea b/Tests/feaLib/data/MultipleLookupsPerGlyph.fea
new file mode 100644
index 00000000..e0c22226
--- /dev/null
+++ b/Tests/feaLib/data/MultipleLookupsPerGlyph.fea
@@ -0,0 +1,11 @@
+lookup a_to_bc {
+	sub a by b c;
+} a_to_bc;
+
+lookup b_to_d {
+	sub b by d;
+} b_to_d;
+
+feature test {
+	sub a' lookup a_to_bc lookup b_to_d b;
+} test;
\ No newline at end of file
diff --git a/Tests/feaLib/data/MultipleLookupsPerGlyph.ttx b/Tests/feaLib/data/MultipleLookupsPerGlyph.ttx
new file mode 100644
index 00000000..927694cb
--- /dev/null
+++ b/Tests/feaLib/data/MultipleLookupsPerGlyph.ttx
@@ -0,0 +1,76 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ttFont>
+
+  <GSUB>
+    <Version value="0x00010000"/>
+    <ScriptList>
+      <!-- ScriptCount=1 -->
+      <ScriptRecord index="0">
+        <ScriptTag value="DFLT"/>
+        <Script>
+          <DefaultLangSys>
+            <ReqFeatureIndex value="65535"/>
+            <!-- FeatureCount=1 -->
+            <FeatureIndex index="0" value="0"/>
+          </DefaultLangSys>
+          <!-- LangSysCount=0 -->
+        </Script>
+      </ScriptRecord>
+    </ScriptList>
+    <FeatureList>
+      <!-- FeatureCount=1 -->
+      <FeatureRecord index="0">
+        <FeatureTag value="test"/>
+        <Feature>
+          <!-- LookupCount=1 -->
+          <LookupListIndex index="0" value="2"/>
+        </Feature>
+      </FeatureRecord>
+    </FeatureList>
+    <LookupList>
+      <!-- LookupCount=3 -->
+      <Lookup index="0">
+        <LookupType value="2"/>
+        <LookupFlag value="0"/>
+        <!-- SubTableCount=1 -->
+        <MultipleSubst index="0">
+          <Substitution in="a" out="b,c"/>
+        </MultipleSubst>
+      </Lookup>
+      <Lookup index="1">
+        <LookupType value="1"/>
+        <LookupFlag value="0"/>
+        <!-- SubTableCount=1 -->
+        <SingleSubst index="0">
+          <Substitution in="b" out="d"/>
+        </SingleSubst>
+      </Lookup>
+      <Lookup index="2">
+        <LookupType value="6"/>
+        <LookupFlag value="0"/>
+        <!-- SubTableCount=1 -->
+        <ChainContextSubst index="0" Format="3">
+          <!-- BacktrackGlyphCount=0 -->
+          <!-- InputGlyphCount=1 -->
+          <InputCoverage index="0">
+            <Glyph value="a"/>
+          </InputCoverage>
+          <!-- LookAheadGlyphCount=1 -->
+          <LookAheadCoverage index="0">
+            <Glyph value="b"/>
+          </LookAheadCoverage>
+          <!-- SubstCount=2 -->
+          <SubstLookupRecord index="0">
+            <SequenceIndex value="0"/>
+            <LookupListIndex value="0"/>
+          </SubstLookupRecord>
+          <SubstLookupRecord index="1">
+            <SequenceIndex value="0"/>
+            <LookupListIndex value="1"/>
+          </SubstLookupRecord>
+        </ChainContextSubst>
+      </Lookup>
+    </LookupList>
+  </GSUB>
+
+</ttFont>
diff --git a/Tests/feaLib/data/MultipleLookupsPerGlyph2.fea b/Tests/feaLib/data/MultipleLookupsPerGlyph2.fea
new file mode 100644
index 00000000..5a9d19b2
--- /dev/null
+++ b/Tests/feaLib/data/MultipleLookupsPerGlyph2.fea
@@ -0,0 +1,11 @@
+lookup a_reduce_sb {
+       pos a <-80 0 -160 0>;
+} a_reduce_sb;
+
+lookup a_raise {
+       pos a <0 100 0 0>;
+} a_raise;
+
+feature test {
+       pos a' lookup a_reduce_sb lookup a_raise b;
+} test;
\ No newline at end of file
diff --git a/Tests/feaLib/data/MultipleLookupsPerGlyph2.ttx b/Tests/feaLib/data/MultipleLookupsPerGlyph2.ttx
new file mode 100644
index 00000000..008d95b6
--- /dev/null
+++ b/Tests/feaLib/data/MultipleLookupsPerGlyph2.ttx
@@ -0,0 +1,84 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ttFont>
+
+  <GPOS>
+    <Version value="0x00010000"/>
+    <ScriptList>
+      <!-- ScriptCount=1 -->
+      <ScriptRecord index="0">
+        <ScriptTag value="DFLT"/>
+        <Script>
+          <DefaultLangSys>
+            <ReqFeatureIndex value="65535"/>
+            <!-- FeatureCount=1 -->
+            <FeatureIndex index="0" value="0"/>
+          </DefaultLangSys>
+          <!-- LangSysCount=0 -->
+        </Script>
+      </ScriptRecord>
+    </ScriptList>
+    <FeatureList>
+      <!-- FeatureCount=1 -->
+      <FeatureRecord index="0">
+        <FeatureTag value="test"/>
+        <Feature>
+          <!-- LookupCount=1 -->
+          <LookupListIndex index="0" value="2"/>
+        </Feature>
+      </FeatureRecord>
+    </FeatureList>
+    <LookupList>
+      <!-- LookupCount=3 -->
+      <Lookup index="0">
+        <LookupType value="1"/>
+        <LookupFlag value="0"/>
+        <!-- SubTableCount=1 -->
+        <SinglePos index="0" Format="1">
+          <Coverage>
+            <Glyph value="a"/>
+          </Coverage>
+          <ValueFormat value="5"/>
+          <Value XPlacement="-80" XAdvance="-160"/>
+        </SinglePos>
+      </Lookup>
+      <Lookup index="1">
+        <LookupType value="1"/>
+        <LookupFlag value="0"/>
+        <!-- SubTableCount=1 -->
+        <SinglePos index="0" Format="1">
+          <Coverage>
+            <Glyph value="a"/>
+          </Coverage>
+          <ValueFormat value="2"/>
+          <Value YPlacement="100"/>
+        </SinglePos>
+      </Lookup>
+      <Lookup index="2">
+        <LookupType value="8"/>
+        <LookupFlag value="0"/>
+        <!-- SubTableCount=1 -->
+        <ChainContextPos index="0" Format="3">
+          <!-- BacktrackGlyphCount=0 -->
+          <!-- InputGlyphCount=1 -->
+          <InputCoverage index="0">
+            <Glyph value="a"/>
+          </InputCoverage>
+          <!-- LookAheadGlyphCount=1 -->
+          <LookAheadCoverage index="0">
+            <Glyph value="b"/>
+          </LookAheadCoverage>
+          <!-- PosCount=2 -->
+          <PosLookupRecord index="0">
+            <SequenceIndex value="0"/>
+            <LookupListIndex value="0"/>
+          </PosLookupRecord>
+          <PosLookupRecord index="1">
+            <SequenceIndex value="0"/>
+            <LookupListIndex value="1"/>
+          </PosLookupRecord>
+        </ChainContextPos>
+      </Lookup>
+    </LookupList>
+  </GPOS>
+
+</ttFont>
diff --git a/Tests/feaLib/parser_test.py b/Tests/feaLib/parser_test.py
index d05a8244..87b8c96a 100644
--- a/Tests/feaLib/parser_test.py
+++ b/Tests/feaLib/parser_test.py
@@ -1065,7 +1065,7 @@ class ParserTest(unittest.TestCase):
         self.assertEqual(glyphstr(pos.prefix), "[A a] [B b]")
         self.assertEqual(glyphstr(pos.glyphs), "I [N n] P")
         self.assertEqual(glyphstr(pos.suffix), "[Y y] [Z z]")
-        self.assertEqual(pos.lookups, [lookup1, lookup2, None])
+        self.assertEqual(pos.lookups, [[lookup1], [lookup2], None])
 
     def test_gpos_type_8_lookup_with_values(self):
         self.assertRaisesRegex(
@@ -1508,8 +1508,8 @@ class ParserTest(unittest.TestCase):
     def test_substitute_lookups(self):  # GSUB LookupType 6
         doc = Parser(self.getpath("spec5fi1.fea"), GLYPHNAMES).parse()
         [_, _, _, langsys, ligs, sub, feature] = doc.statements
-        self.assertEqual(feature.statements[0].lookups, [ligs, None, sub])
-        self.assertEqual(feature.statements[1].lookups, [ligs, None, sub])
+        self.assertEqual(feature.statements[0].lookups, [[ligs], None, [sub]])
+        self.assertEqual(feature.statements[1].lookups, [[ligs], None, [sub]])
 
     def test_substitute_missing_by(self):
         self.assertRaisesRegex(
diff --git a/Tests/fontBuilder/data/test_var.ttf.ttx b/Tests/fontBuilder/data/test_var.ttf.ttx
index bc1aae25..ed8fd307 100644
--- a/Tests/fontBuilder/data/test_var.ttf.ttx
+++ b/Tests/fontBuilder/data/test_var.ttf.ttx
@@ -204,6 +204,9 @@
     <namerecord nameID="261" platformID="1" platEncID="0" langID="0x0" unicode="True">
       Right Up
     </namerecord>
+    <namerecord nameID="262" platformID="1" platEncID="0" langID="0x0" unicode="True">
+      Neutral
+    </namerecord>
     <namerecord nameID="1" platformID="1" platEncID="0" langID="0x4" unicode="True">
       HalloTestFont
     </namerecord>
@@ -237,6 +240,9 @@
     <namerecord nameID="261" platformID="3" platEncID="1" langID="0x409">
       Right Up
     </namerecord>
+    <namerecord nameID="262" platformID="3" platEncID="1" langID="0x409">
+      Neutral
+    </namerecord>
     <namerecord nameID="1" platformID="3" platEncID="1" langID="0x413">
       HalloTestFont
     </namerecord>
@@ -363,6 +369,86 @@
     </FeatureVariations>
   </GSUB>
 
+  <STAT>
+    <Version value="0x00010001"/>
+    <DesignAxisRecordSize value="8"/>
+    <!-- DesignAxisCount=4 -->
+    <DesignAxisRecord>
+      <Axis index="0">
+        <AxisTag value="LEFT"/>
+        <AxisNameID value="256"/>  <!-- Left -->
+        <AxisOrdering value="0"/>
+      </Axis>
+      <Axis index="1">
+        <AxisTag value="RGHT"/>
+        <AxisNameID value="257"/>  <!-- Right -->
+        <AxisOrdering value="1"/>
+      </Axis>
+      <Axis index="2">
+        <AxisTag value="UPPP"/>
+        <AxisNameID value="258"/>  <!-- Up -->
+        <AxisOrdering value="2"/>
+      </Axis>
+      <Axis index="3">
+        <AxisTag value="DOWN"/>
+        <AxisNameID value="259"/>  <!-- Down -->
+        <AxisOrdering value="3"/>
+      </Axis>
+    </DesignAxisRecord>
+    <!-- AxisValueCount=8 -->
+    <AxisValueArray>
+      <AxisValue index="0" Format="1">
+        <AxisIndex value="0"/>
+        <Flags value="2"/>
+        <ValueNameID value="262"/>  <!-- Neutral -->
+        <Value value="0.0"/>
+      </AxisValue>
+      <AxisValue index="1" Format="1">
+        <AxisIndex value="0"/>
+        <Flags value="0"/>
+        <ValueNameID value="256"/>  <!-- Left -->
+        <Value value="100.0"/>
+      </AxisValue>
+      <AxisValue index="2" Format="1">
+        <AxisIndex value="1"/>
+        <Flags value="2"/>
+        <ValueNameID value="262"/>  <!-- Neutral -->
+        <Value value="0.0"/>
+      </AxisValue>
+      <AxisValue index="3" Format="1">
+        <AxisIndex value="1"/>
+        <Flags value="0"/>
+        <ValueNameID value="257"/>  <!-- Right -->
+        <Value value="100.0"/>
+      </AxisValue>
+      <AxisValue index="4" Format="1">
+        <AxisIndex value="2"/>
+        <Flags value="2"/>
+        <ValueNameID value="262"/>  <!-- Neutral -->
+        <Value value="0.0"/>
+      </AxisValue>
+      <AxisValue index="5" Format="1">
+        <AxisIndex value="2"/>
+        <Flags value="0"/>
+        <ValueNameID value="258"/>  <!-- Up -->
+        <Value value="100.0"/>
+      </AxisValue>
+      <AxisValue index="6" Format="1">
+        <AxisIndex value="3"/>
+        <Flags value="2"/>
+        <ValueNameID value="262"/>  <!-- Neutral -->
+        <Value value="0.0"/>
+      </AxisValue>
+      <AxisValue index="7" Format="1">
+        <AxisIndex value="3"/>
+        <Flags value="0"/>
+        <ValueNameID value="259"/>  <!-- Down -->
+        <Value value="100.0"/>
+      </AxisValue>
+    </AxisValueArray>
+    <ElidedFallbackNameID value="2"/>  <!-- TotallyNormal -->
+  </STAT>
+
   <fvar>
 
     <!-- Left -->
diff --git a/Tests/fontBuilder/fontBuilder_test.py b/Tests/fontBuilder/fontBuilder_test.py
index bc7837c3..6368cb87 100644
--- a/Tests/fontBuilder/fontBuilder_test.py
+++ b/Tests/fontBuilder/fontBuilder_test.py
@@ -226,6 +226,13 @@ def test_build_var(tmpdir):
         featureTag="rclt",
     )
 
+    statAxes = []
+    for tag, minVal, defaultVal, maxVal, name in axes:
+        values = [dict(name="Neutral", value=defaultVal, flags=0x2),
+                  dict(name=name, value=maxVal)]
+        statAxes.append(dict(tag=tag, name=name, values=values))
+    fb.setupStat(statAxes)
+
     fb.setupOS2()
     fb.setupPost()
     fb.setupDummyDSIG()
diff --git a/Tests/merge_test.py b/Tests/merge_test.py
index 00e719b8..0fb89c10 100644
--- a/Tests/merge_test.py
+++ b/Tests/merge_test.py
@@ -1,7 +1,12 @@
+import io
+import itertools
 from fontTools.misc.py23 import *
 from fontTools import ttLib
+from fontTools.ttLib.tables._g_l_y_f import Glyph
+from fontTools.fontBuilder import FontBuilder
 from fontTools.merge import *
 import unittest
+import pytest
 
 
 class MergeIntegrationTest(unittest.TestCase):
@@ -113,6 +118,53 @@ class CmapMergeUnitTest(unittest.TestCase):
 		self.assertEqual(self.merger.duplicateGlyphsPerFont, [{}, {'space#0': 'space#1'}])
 
 
+def _compile(ttFont):
+	buf = io.BytesIO()
+	ttFont.save(buf)
+	buf.seek(0)
+	return buf
+
+
+def _make_fontfile_with_OS2(*, version, **kwargs):
+	upem = 1000
+	glyphOrder = [".notdef", "a"]
+	cmap = {0x61: "a"}
+	glyphs = {gn: Glyph() for gn in glyphOrder}
+	hmtx = {gn: (500, 0) for gn in glyphOrder}
+	names = {"familyName": "TestOS2", "styleName": "Regular"}
+
+	fb = FontBuilder(unitsPerEm=upem)
+	fb.setupGlyphOrder(glyphOrder)
+	fb.setupCharacterMap(cmap)
+	fb.setupGlyf(glyphs)
+	fb.setupHorizontalMetrics(hmtx)
+	fb.setupHorizontalHeader()
+	fb.setupNameTable(names)
+	fb.setupOS2(version=version, **kwargs)
+
+	return _compile(fb.font)
+
+
+def _merge_and_recompile(fontfiles, options=None):
+	merger = Merger(options)
+	merged = merger.merge(fontfiles)
+	buf = _compile(merged)
+	return ttLib.TTFont(buf)
+
+
+@pytest.mark.parametrize(
+	"v1, v2", list(itertools.permutations(range(5+1), 2))
+)
+def test_merge_OS2_mixed_versions(v1, v2):
+	# https://github.com/fonttools/fonttools/issues/1865
+	fontfiles = [
+		_make_fontfile_with_OS2(version=v1),
+		_make_fontfile_with_OS2(version=v2),
+	]
+	merged = _merge_and_recompile(fontfiles)
+	assert merged["OS/2"].version == max(v1, v2)
+
+
 if __name__ == "__main__":
 	import sys
 	sys.exit(unittest.main())
diff --git a/Tests/otlLib/builder_test.py b/Tests/otlLib/builder_test.py
index 3675395f..727d685f 100644
--- a/Tests/otlLib/builder_test.py
+++ b/Tests/otlLib/builder_test.py
@@ -1,5 +1,9 @@
+import io
+import struct
+from fontTools.misc.fixedTools import floatToFixed
 from fontTools.misc.testTools import getXML
 from fontTools.otlLib import builder
+from fontTools import ttLib
 from fontTools.ttLib.tables import otTables
 import pytest
 
@@ -1106,6 +1110,291 @@ class ClassDefBuilderTest(object):
         assert not b.canAdd({"f"})
 
 
+buildStatTable_test_data = [
+    ([
+        dict(
+            tag="wght",
+            name="Weight",
+            values=[
+                dict(value=100, name='Thin'),
+                dict(value=400, name='Regular', flags=0x2),
+                dict(value=900, name='Black')])], None, "Regular", [
+        '  <STAT>',
+        '    <Version value="0x00010001"/>',
+        '    <DesignAxisRecordSize value="8"/>',
+        '    <!-- DesignAxisCount=1 -->',
+        '    <DesignAxisRecord>',
+        '      <Axis index="0">',
+        '        <AxisTag value="wght"/>',
+        '        <AxisNameID value="257"/>  <!-- Weight -->',
+        '        <AxisOrdering value="0"/>',
+        '      </Axis>',
+        '    </DesignAxisRecord>',
+        '    <!-- AxisValueCount=3 -->',
+        '    <AxisValueArray>',
+        '      <AxisValue index="0" Format="1">',
+        '        <AxisIndex value="0"/>',
+        '        <Flags value="0"/>',
+        '        <ValueNameID value="258"/>  <!-- Thin -->',
+        '        <Value value="100.0"/>',
+        '      </AxisValue>',
+        '      <AxisValue index="1" Format="1">',
+        '        <AxisIndex value="0"/>',
+        '        <Flags value="2"/>',
+        '        <ValueNameID value="256"/>  <!-- Regular -->',
+        '        <Value value="400.0"/>',
+        '      </AxisValue>',
+        '      <AxisValue index="2" Format="1">',
+        '        <AxisIndex value="0"/>',
+        '        <Flags value="0"/>',
+        '        <ValueNameID value="259"/>  <!-- Black -->',
+        '        <Value value="900.0"/>',
+        '      </AxisValue>',
+        '    </AxisValueArray>',
+        '    <ElidedFallbackNameID value="256"/>  <!-- Regular -->',
+        '  </STAT>']),
+    ([
+        dict(
+            tag="wght",
+            name=dict(en="Weight", nl="Gewicht"),
+            values=[
+                dict(value=100, name=dict(en='Thin', nl='Dun')),
+                dict(value=400, name='Regular', flags=0x2),
+                dict(value=900, name='Black'),
+            ]),
+        dict(
+            tag="wdth",
+            name="Width",
+            values=[
+                dict(value=50, name='Condensed'),
+                dict(value=100, name='Regular', flags=0x2),
+                dict(value=200, name='Extended')])], None, 2, [
+        '  <STAT>',
+        '    <Version value="0x00010001"/>',
+        '    <DesignAxisRecordSize value="8"/>',
+        '    <!-- DesignAxisCount=2 -->',
+        '    <DesignAxisRecord>',
+        '      <Axis index="0">',
+        '        <AxisTag value="wght"/>',
+        '        <AxisNameID value="256"/>  <!-- Weight -->',
+        '        <AxisOrdering value="0"/>',
+        '      </Axis>',
+        '      <Axis index="1">',
+        '        <AxisTag value="wdth"/>',
+        '        <AxisNameID value="260"/>  <!-- Width -->',
+        '        <AxisOrdering value="1"/>',
+        '      </Axis>',
+        '    </DesignAxisRecord>',
+        '    <!-- AxisValueCount=6 -->',
+        '    <AxisValueArray>',
+        '      <AxisValue index="0" Format="1">',
+        '        <AxisIndex value="0"/>',
+        '        <Flags value="0"/>',
+        '        <ValueNameID value="257"/>  <!-- Thin -->',
+        '        <Value value="100.0"/>',
+        '      </AxisValue>',
+        '      <AxisValue index="1" Format="1">',
+        '        <AxisIndex value="0"/>',
+        '        <Flags value="2"/>',
+        '        <ValueNameID value="258"/>  <!-- Regular -->',
+        '        <Value value="400.0"/>',
+        '      </AxisValue>',
+        '      <AxisValue index="2" Format="1">',
+        '        <AxisIndex value="0"/>',
+        '        <Flags value="0"/>',
+        '        <ValueNameID value="259"/>  <!-- Black -->',
+        '        <Value value="900.0"/>',
+        '      </AxisValue>',
+        '      <AxisValue index="3" Format="1">',
+        '        <AxisIndex value="1"/>',
+        '        <Flags value="0"/>',
+        '        <ValueNameID value="261"/>  <!-- Condensed -->',
+        '        <Value value="50.0"/>',
+        '      </AxisValue>',
+        '      <AxisValue index="4" Format="1">',
+        '        <AxisIndex value="1"/>',
+        '        <Flags value="2"/>',
+        '        <ValueNameID value="258"/>  <!-- Regular -->',
+        '        <Value value="100.0"/>',
+        '      </AxisValue>',
+        '      <AxisValue index="5" Format="1">',
+        '        <AxisIndex value="1"/>',
+        '        <Flags value="0"/>',
+        '        <ValueNameID value="262"/>  <!-- Extended -->',
+        '        <Value value="200.0"/>',
+        '      </AxisValue>',
+        '    </AxisValueArray>',
+        '    <ElidedFallbackNameID value="2"/>  <!-- missing from name table -->',
+        '  </STAT>']),
+    ([
+        dict(
+            tag="wght",
+            name="Weight",
+            values=[
+                dict(value=400, name='Regular', flags=0x2),
+                dict(value=600, linkedValue=650, name='Bold')])], None, 18, [
+        '  <STAT>',
+        '    <Version value="0x00010001"/>',
+        '    <DesignAxisRecordSize value="8"/>',
+        '    <!-- DesignAxisCount=1 -->',
+        '    <DesignAxisRecord>',
+        '      <Axis index="0">',
+        '        <AxisTag value="wght"/>',
+        '        <AxisNameID value="256"/>  <!-- Weight -->',
+        '        <AxisOrdering value="0"/>',
+        '      </Axis>',
+        '    </DesignAxisRecord>',
+        '    <!-- AxisValueCount=2 -->',
+        '    <AxisValueArray>',
+        '      <AxisValue index="0" Format="1">',
+        '        <AxisIndex value="0"/>',
+        '        <Flags value="2"/>',
+        '        <ValueNameID value="257"/>  <!-- Regular -->',
+        '        <Value value="400.0"/>',
+        '      </AxisValue>',
+        '      <AxisValue index="1" Format="3">',
+        '        <AxisIndex value="0"/>',
+        '        <Flags value="0"/>',
+        '        <ValueNameID value="258"/>  <!-- Bold -->',
+        '        <Value value="600.0"/>',
+        '        <LinkedValue value="650.0"/>',
+        '      </AxisValue>',
+        '    </AxisValueArray>',
+        '    <ElidedFallbackNameID value="18"/>  <!-- missing from name table -->',
+        '  </STAT>']),
+    ([
+        dict(
+            tag="opsz",
+            name="Optical Size",
+            values=[
+                dict(nominalValue=6, rangeMaxValue=10, name='Small'),
+                dict(rangeMinValue=10, nominalValue=14, rangeMaxValue=24, name='Text', flags=0x2),
+                dict(rangeMinValue=24, nominalValue=600, name='Display')])], None, 2, [
+        '  <STAT>',
+        '    <Version value="0x00010001"/>',
+        '    <DesignAxisRecordSize value="8"/>',
+        '    <!-- DesignAxisCount=1 -->',
+        '    <DesignAxisRecord>',
+        '      <Axis index="0">',
+        '        <AxisTag value="opsz"/>',
+        '        <AxisNameID value="256"/>  <!-- Optical Size -->',
+        '        <AxisOrdering value="0"/>',
+        '      </Axis>',
+        '    </DesignAxisRecord>',
+        '    <!-- AxisValueCount=3 -->',
+        '    <AxisValueArray>',
+        '      <AxisValue index="0" Format="2">',
+        '        <AxisIndex value="0"/>',
+        '        <Flags value="0"/>',
+        '        <ValueNameID value="257"/>  <!-- Small -->',
+        '        <NominalValue value="6.0"/>',
+        '        <RangeMinValue value="-32768.0"/>',
+        '        <RangeMaxValue value="10.0"/>',
+        '      </AxisValue>',
+        '      <AxisValue index="1" Format="2">',
+        '        <AxisIndex value="0"/>',
+        '        <Flags value="2"/>',
+        '        <ValueNameID value="258"/>  <!-- Text -->',
+        '        <NominalValue value="14.0"/>',
+        '        <RangeMinValue value="10.0"/>',
+        '        <RangeMaxValue value="24.0"/>',
+        '      </AxisValue>',
+        '      <AxisValue index="2" Format="2">',
+        '        <AxisIndex value="0"/>',
+        '        <Flags value="0"/>',
+        '        <ValueNameID value="259"/>  <!-- Display -->',
+        '        <NominalValue value="600.0"/>',
+        '        <RangeMinValue value="24.0"/>',
+        '        <RangeMaxValue value="32767.99998"/>',
+        '      </AxisValue>',
+        '    </AxisValueArray>',
+        '    <ElidedFallbackNameID value="2"/>  <!-- missing from name table -->',
+        '  </STAT>']),
+    ([
+        dict(
+            tag="wght",
+            name="Weight",
+            ordering=1,
+            values=[]),
+        dict(
+            tag="ABCD",
+            name="ABCDTest",
+            ordering=0,
+            values=[
+                dict(value=100, name="Regular", flags=0x2)])],
+     [dict(location=dict(wght=300, ABCD=100), name='Regular ABCD')], 18, [
+        '  <STAT>',
+        '    <Version value="0x00010002"/>',
+        '    <DesignAxisRecordSize value="8"/>',
+        '    <!-- DesignAxisCount=2 -->',
+        '    <DesignAxisRecord>',
+        '      <Axis index="0">',
+        '        <AxisTag value="wght"/>',
+        '        <AxisNameID value="256"/>  <!-- Weight -->',
+        '        <AxisOrdering value="1"/>',
+        '      </Axis>',
+        '      <Axis index="1">',
+        '        <AxisTag value="ABCD"/>',
+        '        <AxisNameID value="257"/>  <!-- ABCDTest -->',
+        '        <AxisOrdering value="0"/>',
+        '      </Axis>',
+        '    </DesignAxisRecord>',
+        '    <!-- AxisValueCount=2 -->',
+        '    <AxisValueArray>',
+        '      <AxisValue index="0" Format="4">',
+        '        <!-- AxisCount=2 -->',
+        '        <Flags value="0"/>',
+        '        <ValueNameID value="259"/>  <!-- Regular ABCD -->',
+        '        <AxisValueRecord index="0">',
+        '          <AxisIndex value="0"/>',
+        '          <Value value="300.0"/>',
+        '        </AxisValueRecord>',
+        '        <AxisValueRecord index="1">',
+        '          <AxisIndex value="1"/>',
+        '          <Value value="100.0"/>',
+        '        </AxisValueRecord>',
+        '      </AxisValue>',
+        '      <AxisValue index="1" Format="1">',
+        '        <AxisIndex value="1"/>',
+        '        <Flags value="2"/>',
+        '        <ValueNameID value="258"/>  <!-- Regular -->',
+        '        <Value value="100.0"/>',
+        '      </AxisValue>',
+        '    </AxisValueArray>',
+        '    <ElidedFallbackNameID value="18"/>  <!-- missing from name table -->',
+        '  </STAT>']),
+]
+
+
+@pytest.mark.parametrize("axes, axisValues, elidedFallbackName, expected_ttx", buildStatTable_test_data)
+def test_buildStatTable(axes, axisValues, elidedFallbackName, expected_ttx):
+    font = ttLib.TTFont()
+    font["name"] = ttLib.newTable("name")
+    font["name"].names = []
+    builder.buildStatTable(font, axes, axisValues, elidedFallbackName)
+    f = io.StringIO()
+    font.saveXML(f, tables=["STAT"])
+    ttx = f.getvalue().splitlines()
+    ttx = ttx[3:-2]  # strip XML header and <ttFont> element
+    assert expected_ttx == ttx
+    # Compile and round-trip
+    f = io.BytesIO()
+    font.save(f)
+    font = ttLib.TTFont(f)
+    f = io.StringIO()
+    font.saveXML(f, tables=["STAT"])
+    ttx = f.getvalue().splitlines()
+    ttx = ttx[3:-2]  # strip XML header and <ttFont> element
+    assert expected_ttx == ttx
+
+
+def test_stat_infinities():
+    negInf = floatToFixed(builder.AXIS_VALUE_NEGATIVE_INFINITY, 16)
+    assert struct.pack(">l", negInf) == b"\x80\x00\x00\x00"
+    posInf = floatToFixed(builder.AXIS_VALUE_POSITIVE_INFINITY, 16)
+    assert struct.pack(">l", posInf) == b"\x7f\xff\xff\xff"
+
+
 if __name__ == "__main__":
     import sys
 
diff --git a/Tests/subset/data/TestContextSubstFormat3.ttx b/Tests/subset/data/TestContextSubstFormat3.ttx
new file mode 100644
index 00000000..899b037e
--- /dev/null
+++ b/Tests/subset/data/TestContextSubstFormat3.ttx
@@ -0,0 +1,610 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ttFont sfntVersion="\x00\x01\x00\x00" ttLibVersion="4.9">
+
+  <GlyphOrder>
+    <!-- The 'id' attribute is only for humans; it is ignored when parsed. -->
+    <GlyphID id="0" name=".notdef"/>
+    <GlyphID id="1" name="plus"/>
+    <GlyphID id="2" name="glyph00002"/>
+    <GlyphID id="3" name="glyph00003"/>
+    <GlyphID id="4" name="glyph00004"/>
+    <GlyphID id="5" name="glyph00005"/>
+    <GlyphID id="6" name="glyph00006"/>
+    <GlyphID id="7" name="glyph00007"/>
+  </GlyphOrder>
+
+  <head>
+    <!-- Most of this table will be recalculated by the compiler -->
+    <tableVersion value="1.0"/>
+    <fontRevision value="1.0"/>
+    <checkSumAdjustment value="0xa69ed898"/>
+    <magicNumber value="0x5f0f3cf5"/>
+    <flags value="00000000 00001111"/>
+    <unitsPerEm value="1000"/>
+    <created value="Mon Nov 21 06:10:39 2016"/>
+    <modified value="Fri Apr 24 05:31:23 2020"/>
+    <xMin value="-1000"/>
+    <yMin value="-509"/>
+    <xMax value="1135"/>
+    <yMax value="1194"/>
+    <macStyle value="00000000 00000000"/>
+    <lowestRecPPEM value="8"/>
+    <fontDirectionHint value="0"/>
+    <indexToLocFormat value="0"/>
+    <glyphDataFormat value="0"/>
+  </head>
+
+  <hhea>
+    <tableVersion value="0x00010000"/>
+    <ascent value="977"/>
+    <descent value="-205"/>
+    <lineGap value="67"/>
+    <advanceWidthMax value="1000"/>
+    <minLeftSideBearing value="-1000"/>
+    <minRightSideBearing value="-1000"/>
+    <xMaxExtent value="1135"/>
+    <caretSlopeRise value="1"/>
+    <caretSlopeRun value="0"/>
+    <caretOffset value="0"/>
+    <reserved0 value="0"/>
+    <reserved1 value="0"/>
+    <reserved2 value="0"/>
+    <reserved3 value="0"/>
+    <metricDataFormat value="0"/>
+    <numberOfHMetrics value="1"/>
+  </hhea>
+
+  <maxp>
+    <!-- Most of this table will be recalculated by the compiler -->
+    <tableVersion value="0x10000"/>
+    <numGlyphs value="8"/>
+    <maxPoints value="240"/>
+    <maxContours value="41"/>
+    <maxCompositePoints value="163"/>
+    <maxCompositeContours value="12"/>
+    <maxZones value="1"/>
+    <maxTwilightPoints value="0"/>
+    <maxStorage value="0"/>
+    <maxFunctionDefs value="0"/>
+    <maxInstructionDefs value="0"/>
+    <maxStackElements value="0"/>
+    <maxSizeOfInstructions value="0"/>
+    <maxComponentElements value="4"/>
+    <maxComponentDepth value="3"/>
+  </maxp>
+
+  <OS_2>
+    <!-- The fields 'usFirstCharIndex' and 'usLastCharIndex'
+         will be recalculated by the compiler -->
+    <version value="4"/>
+    <xAvgCharWidth value="500"/>
+    <usWeightClass value="500"/>
+    <usWidthClass value="5"/>
+    <fsType value="00000000 00000000"/>
+    <ySubscriptXSize value="665"/>
+    <ySubscriptYSize value="716"/>
+    <ySubscriptXOffset value="0"/>
+    <ySubscriptYOffset value="143"/>
+    <ySuperscriptXSize value="0"/>
+    <ySuperscriptYSize value="0"/>
+    <ySuperscriptXOffset value="0"/>
+    <ySuperscriptYOffset value="0"/>
+    <yStrikeoutSize value="51"/>
+    <yStrikeoutPosition value="265"/>
+    <sFamilyClass value="2057"/>
+    <panose>
+      <bFamilyType value="2"/>
+      <bSerifStyle value="0"/>
+      <bWeight value="6"/>
+      <bProportion value="9"/>
+      <bContrast value="0"/>
+      <bStrokeVariation value="0"/>
+      <bArmStyle value="0"/>
+      <bLetterForm value="0"/>
+      <bMidline value="0"/>
+      <bXHeight value="0"/>
+    </panose>
+    <ulUnicodeRange1 value="00000000 00000000 00000000 00000001"/>
+    <ulUnicodeRange2 value="00000000 00000000 00000000 00000000"/>
+    <ulUnicodeRange3 value="00000000 00000000 00000000 00000000"/>
+    <ulUnicodeRange4 value="00000000 00000000 00000000 00000000"/>
+    <achVendID value="BE5N"/>
+    <fsSelection value="00000000 11000000"/>
+    <usFirstCharIndex value="43"/>
+    <usLastCharIndex value="43"/>
+    <sTypoAscender value="977"/>
+    <sTypoDescender value="-272"/>
+    <sTypoLineGap value="0"/>
+    <usWinAscent value="977"/>
+    <usWinDescent value="272"/>
+    <ulCodePageRange1 value="00100000 00000000 00000001 00011111"/>
+    <ulCodePageRange2 value="11000100 00000000 00000000 00000000"/>
+    <sxHeight value="530"/>
+    <sCapHeight value="735"/>
+    <usDefaultChar value="0"/>
+    <usBreakChar value="32"/>
+    <usMaxContext value="8"/>
+  </OS_2>
+
+  <hmtx>
+    <mtx name=".notdef" width="500" lsb="57"/>
+    <mtx name="glyph00002" width="500" lsb="57"/>
+    <mtx name="glyph00003" width="500" lsb="57"/>
+    <mtx name="glyph00004" width="500" lsb="-8"/>
+    <mtx name="glyph00005" width="500" lsb="-8"/>
+    <mtx name="glyph00006" width="500" lsb="-8"/>
+    <mtx name="glyph00007" width="500" lsb="-65"/>
+    <mtx name="plus" width="500" lsb="57"/>
+  </hmtx>
+
+  <cmap>
+    <tableVersion version="0"/>
+    <cmap_format_4 platformID="0" platEncID="3" language="0">
+      <map code="0x2b" name="plus"/><!-- PLUS SIGN -->
+    </cmap_format_4>
+    <cmap_format_12 platformID="0" platEncID="4" format="12" reserved="0" length="28" language="0" nGroups="1">
+      <map code="0x2b" name="plus"/><!-- PLUS SIGN -->
+    </cmap_format_12>
+    <cmap_format_4 platformID="3" platEncID="1" language="0">
+      <map code="0x2b" name="plus"/><!-- PLUS SIGN -->
+    </cmap_format_4>
+    <cmap_format_12 platformID="3" platEncID="10" format="12" reserved="0" length="28" language="0" nGroups="1">
+      <map code="0x2b" name="plus"/><!-- PLUS SIGN -->
+    </cmap_format_12>
+  </cmap>
+
+  <loca>
+    <!-- The 'loca' table will be calculated by the compiler -->
+  </loca>
+
+  <glyf>
+
+    <!-- The xMin, yMin, xMax and yMax values
+         will be recalculated by the compiler. -->
+
+    <TTGlyph name=".notdef"/><!-- contains no outline data -->
+
+    <TTGlyph name="glyph00002" xMin="57" yMin="139" xMax="508" yMax="541">
+      <contour>
+        <pt x="203" y="139" on="1"/>
+        <pt x="203" y="298" on="1"/>
+        <pt x="57" y="298" on="1"/>
+        <pt x="57" y="382" on="1"/>
+        <pt x="203" y="382" on="1"/>
+        <pt x="203" y="541" on="1"/>
+        <pt x="297" y="541" on="1"/>
+        <pt x="297" y="382" on="1"/>
+        <pt x="508" y="382" on="1"/>
+        <pt x="508" y="298" on="1"/>
+        <pt x="297" y="298" on="1"/>
+        <pt x="297" y="139" on="1"/>
+      </contour>
+      <instructions/>
+    </TTGlyph>
+
+    <TTGlyph name="glyph00003" xMin="57" yMin="139" xMax="508" yMax="541">
+      <contour>
+        <pt x="260" y="139" on="1"/>
+        <pt x="260" y="298" on="1"/>
+        <pt x="57" y="298" on="1"/>
+        <pt x="57" y="382" on="1"/>
+        <pt x="260" y="382" on="1"/>
+        <pt x="260" y="541" on="1"/>
+        <pt x="354" y="541" on="1"/>
+        <pt x="354" y="382" on="1"/>
+        <pt x="508" y="382" on="1"/>
+        <pt x="508" y="298" on="1"/>
+        <pt x="354" y="298" on="1"/>
+        <pt x="354" y="139" on="1"/>
+      </contour>
+      <instructions/>
+    </TTGlyph>
+
+    <TTGlyph name="glyph00004" xMin="-8" yMin="139" xMax="508" yMax="541">
+      <contour>
+        <pt x="203" y="139" on="1"/>
+        <pt x="203" y="298" on="1"/>
+        <pt x="-8" y="298" on="1"/>
+        <pt x="-8" y="382" on="1"/>
+        <pt x="203" y="382" on="1"/>
+        <pt x="203" y="541" on="1"/>
+        <pt x="297" y="541" on="1"/>
+        <pt x="297" y="382" on="1"/>
+        <pt x="508" y="382" on="1"/>
+        <pt x="508" y="298" on="1"/>
+        <pt x="297" y="298" on="1"/>
+        <pt x="297" y="139" on="1"/>
+      </contour>
+      <instructions/>
+    </TTGlyph>
+
+    <TTGlyph name="glyph00005" xMin="-8" yMin="139" xMax="443" yMax="541">
+      <contour>
+        <pt x="203" y="139" on="1"/>
+        <pt x="203" y="298" on="1"/>
+        <pt x="-8" y="298" on="1"/>
+        <pt x="-8" y="382" on="1"/>
+        <pt x="203" y="382" on="1"/>
+        <pt x="203" y="541" on="1"/>
+        <pt x="297" y="541" on="1"/>
+        <pt x="297" y="382" on="1"/>
+        <pt x="443" y="382" on="1"/>
+        <pt x="443" y="298" on="1"/>
+        <pt x="297" y="298" on="1"/>
+        <pt x="297" y="139" on="1"/>
+      </contour>
+      <instructions/>
+    </TTGlyph>
+
+    <TTGlyph name="glyph00006" xMin="-8" yMin="139" xMax="443" yMax="541">
+      <contour>
+        <pt x="146" y="139" on="1"/>
+        <pt x="146" y="298" on="1"/>
+        <pt x="-8" y="298" on="1"/>
+        <pt x="-8" y="382" on="1"/>
+        <pt x="146" y="382" on="1"/>
+        <pt x="146" y="541" on="1"/>
+        <pt x="240" y="541" on="1"/>
+        <pt x="240" y="382" on="1"/>
+        <pt x="443" y="382" on="1"/>
+        <pt x="443" y="298" on="1"/>
+        <pt x="240" y="298" on="1"/>
+        <pt x="240" y="139" on="1"/>
+      </contour>
+      <instructions/>
+    </TTGlyph>
+
+    <TTGlyph name="glyph00007" xMin="-65" yMin="139" xMax="443" yMax="541">
+      <contour>
+        <pt x="203" y="139" on="1"/>
+        <pt x="203" y="298" on="1"/>
+        <pt x="-65" y="298" on="1"/>
+        <pt x="-65" y="382" on="1"/>
+        <pt x="203" y="382" on="1"/>
+        <pt x="203" y="541" on="1"/>
+        <pt x="297" y="541" on="1"/>
+        <pt x="297" y="382" on="1"/>
+        <pt x="443" y="382" on="1"/>
+        <pt x="443" y="298" on="1"/>
+        <pt x="297" y="298" on="1"/>
+        <pt x="297" y="139" on="1"/>
+      </contour>
+      <instructions/>
+    </TTGlyph>
+
+    <TTGlyph name="plus" xMin="57" yMin="139" xMax="443" yMax="541">
+      <contour>
+        <pt x="203" y="139" on="1"/>
+        <pt x="203" y="298" on="1"/>
+        <pt x="57" y="298" on="1"/>
+        <pt x="57" y="382" on="1"/>
+        <pt x="203" y="382" on="1"/>
+        <pt x="203" y="541" on="1"/>
+        <pt x="297" y="541" on="1"/>
+        <pt x="297" y="382" on="1"/>
+        <pt x="443" y="382" on="1"/>
+        <pt x="443" y="298" on="1"/>
+        <pt x="297" y="298" on="1"/>
+        <pt x="297" y="139" on="1"/>
+      </contour>
+      <instructions/>
+    </TTGlyph>
+
+  </glyf>
+
+  <name>
+    <namerecord nameID="0" platformID="3" platEncID="1" langID="0x409">
+      Copyright (c) 2015-2019 Belleve Invis.
+    </namerecord>
+    <namerecord nameID="1" platformID="3" platEncID="1" langID="0x409">
+      Iosevka Medium
+    </namerecord>
+    <namerecord nameID="2" platformID="3" platEncID="1" langID="0x409">
+      Regular
+    </namerecord>
+    <namerecord nameID="3" platformID="3" platEncID="1" langID="0x409">
+      Iosevka Medium Version 3.0.0-rc.8
+    </namerecord>
+    <namerecord nameID="4" platformID="3" platEncID="1" langID="0x409">
+      Iosevka Medium
+    </namerecord>
+    <namerecord nameID="5" platformID="3" platEncID="1" langID="0x409">
+      Version 3.0.0-rc.8; ttfautohint (v1.8.3)
+    </namerecord>
+    <namerecord nameID="6" platformID="3" platEncID="1" langID="0x409">
+      Iosevka-Medium
+    </namerecord>
+  </name>
+
+  <post>
+    <formatType value="3.0"/>
+    <italicAngle value="0.0"/>
+    <underlinePosition value="-50"/>
+    <underlineThickness value="50"/>
+    <isFixedPitch value="1"/>
+    <minMemType42 value="0"/>
+    <maxMemType42 value="6380"/>
+    <minMemType1 value="0"/>
+    <maxMemType1 value="1"/>
+  </post>
+
+  <gasp>
+    <gaspRange rangeMaxPPEM="65535" rangeGaspBehavior="15"/>
+  </gasp>
+
+  <GDEF>
+    <Version value="0x00010000"/>
+    <GlyphClassDef Format="2">
+      <ClassDef glyph=".notdef" class="1"/>
+      <ClassDef glyph="glyph00002" class="1"/>
+      <ClassDef glyph="glyph00003" class="1"/>
+      <ClassDef glyph="glyph00004" class="1"/>
+      <ClassDef glyph="glyph00005" class="1"/>
+      <ClassDef glyph="glyph00006" class="1"/>
+      <ClassDef glyph="glyph00007" class="1"/>
+      <ClassDef glyph="plus" class="1"/>
+    </GlyphClassDef>
+  </GDEF>
+
+  <GPOS>
+    <Version value="0x00010000"/>
+    <ScriptList>
+      <!-- ScriptCount=1 -->
+      <ScriptRecord index="0">
+        <ScriptTag value="DFLT"/>
+        <Script>
+          <DefaultLangSys>
+            <ReqFeatureIndex value="65535"/>
+            <!-- FeatureCount=0 -->
+          </DefaultLangSys>
+          <!-- LangSysCount=0 -->
+        </Script>
+      </ScriptRecord>
+    </ScriptList>
+    <FeatureList>
+      <!-- FeatureCount=0 -->
+    </FeatureList>
+    <LookupList>
+      <!-- LookupCount=0 -->
+    </LookupList>
+  </GPOS>
+
+  <GSUB>
+    <Version value="0x00010000"/>
+    <ScriptList>
+      <!-- ScriptCount=4 -->
+      <ScriptRecord index="0">
+        <ScriptTag value="DFLT"/>
+        <Script>
+          <DefaultLangSys>
+            <ReqFeatureIndex value="65535"/>
+            <!-- FeatureCount=1 -->
+            <FeatureIndex index="0" value="0"/>
+          </DefaultLangSys>
+          <!-- LangSysCount=0 -->
+        </Script>
+      </ScriptRecord>
+      <ScriptRecord index="1">
+        <ScriptTag value="cyrl"/>
+        <Script>
+          <DefaultLangSys>
+            <ReqFeatureIndex value="65535"/>
+            <!-- FeatureCount=1 -->
+            <FeatureIndex index="0" value="0"/>
+          </DefaultLangSys>
+          <!-- LangSysCount=0 -->
+        </Script>
+      </ScriptRecord>
+      <ScriptRecord index="2">
+        <ScriptTag value="grek"/>
+        <Script>
+          <DefaultLangSys>
+            <ReqFeatureIndex value="65535"/>
+            <!-- FeatureCount=1 -->
+            <FeatureIndex index="0" value="0"/>
+          </DefaultLangSys>
+          <!-- LangSysCount=0 -->
+        </Script>
+      </ScriptRecord>
+      <ScriptRecord index="3">
+        <ScriptTag value="latn"/>
+        <Script>
+          <DefaultLangSys>
+            <ReqFeatureIndex value="65535"/>
+            <!-- FeatureCount=1 -->
+            <FeatureIndex index="0" value="0"/>
+          </DefaultLangSys>
+          <!-- LangSysCount=0 -->
+        </Script>
+      </ScriptRecord>
+    </ScriptList>
+    <FeatureList>
+      <!-- FeatureCount=1 -->
+      <FeatureRecord index="0">
+        <FeatureTag value="calt"/>
+        <Feature>
+          <!-- LookupCount=2 -->
+          <LookupListIndex index="0" value="0"/>
+          <LookupListIndex index="1" value="1"/>
+        </Feature>
+      </FeatureRecord>
+    </FeatureList>
+    <LookupList>
+      <!-- LookupCount=6 -->
+      <Lookup index="0">
+        <LookupType value="6"/>
+        <LookupFlag value="0"/>
+        <!-- SubTableCount=1 -->
+        <ChainContextSubst index="0" Format="2">
+          <Coverage Format="1">
+            <Glyph value="plus"/>
+          </Coverage>
+          <BacktrackClassDef Format="1">
+            <ClassDef glyph="glyph00005" class="1"/>
+            <ClassDef glyph="glyph00007" class="1"/>
+          </BacktrackClassDef>
+          <InputClassDef Format="1">
+            <ClassDef glyph="plus" class="1"/>
+          </InputClassDef>
+          <LookAheadClassDef Format="2">
+          </LookAheadClassDef>
+          <!-- ChainSubClassSetCount=2 -->
+          <ChainSubClassSet index="0" empty="1"/>
+          <ChainSubClassSet index="1">
+            <!-- ChainSubClassRuleCount=4 -->
+            <ChainSubClassRule index="0">
+              <!-- BacktrackGlyphCount=1 -->
+              <Backtrack index="0" value="1"/>
+              <!-- InputGlyphCount=1 -->
+              <!-- LookAheadGlyphCount=0 -->
+              <!-- SubstCount=1 -->
+              <SubstLookupRecord index="0">
+                <SequenceIndex value="0"/>
+                <LookupListIndex value="5"/>
+              </SubstLookupRecord>
+            </ChainSubClassRule>
+            <ChainSubClassRule index="1">
+              <!-- BacktrackGlyphCount=0 -->
+              <!-- InputGlyphCount=4 -->
+              <Input index="0" value="1"/>
+              <Input index="1" value="1"/>
+              <Input index="2" value="1"/>
+              <!-- LookAheadGlyphCount=0 -->
+              <!-- SubstCount=4 -->
+              <SubstLookupRecord index="0">
+                <SequenceIndex value="0"/>
+                <LookupListIndex value="4"/>
+              </SubstLookupRecord>
+              <SubstLookupRecord index="1">
+                <SequenceIndex value="1"/>
+                <LookupListIndex value="3"/>
+              </SubstLookupRecord>
+              <SubstLookupRecord index="2">
+                <SequenceIndex value="2"/>
+                <LookupListIndex value="3"/>
+              </SubstLookupRecord>
+              <SubstLookupRecord index="3">
+                <SequenceIndex value="3"/>
+                <LookupListIndex value="2"/>
+              </SubstLookupRecord>
+            </ChainSubClassRule>
+            <ChainSubClassRule index="2">
+              <!-- BacktrackGlyphCount=0 -->
+              <!-- InputGlyphCount=3 -->
+              <Input index="0" value="1"/>
+              <Input index="1" value="1"/>
+              <!-- LookAheadGlyphCount=0 -->
+              <!-- SubstCount=3 -->
+              <SubstLookupRecord index="0">
+                <SequenceIndex value="0"/>
+                <LookupListIndex value="4"/>
+              </SubstLookupRecord>
+              <SubstLookupRecord index="1">
+                <SequenceIndex value="1"/>
+                <LookupListIndex value="3"/>
+              </SubstLookupRecord>
+              <SubstLookupRecord index="2">
+                <SequenceIndex value="2"/>
+                <LookupListIndex value="2"/>
+              </SubstLookupRecord>
+            </ChainSubClassRule>
+            <ChainSubClassRule index="3">
+              <!-- BacktrackGlyphCount=0 -->
+              <!-- InputGlyphCount=2 -->
+              <Input index="0" value="1"/>
+              <!-- LookAheadGlyphCount=0 -->
+              <!-- SubstCount=2 -->
+              <SubstLookupRecord index="0">
+                <SequenceIndex value="0"/>
+                <LookupListIndex value="4"/>
+              </SubstLookupRecord>
+              <SubstLookupRecord index="1">
+                <SequenceIndex value="1"/>
+                <LookupListIndex value="2"/>
+              </SubstLookupRecord>
+            </ChainSubClassRule>
+          </ChainSubClassSet>
+        </ChainContextSubst>
+      </Lookup>
+      <Lookup index="1">
+        <LookupType value="5"/>
+        <LookupFlag value="0"/>
+        <!-- SubTableCount=2 -->
+        <ContextSubst index="0" Format="3">
+          <!-- GlyphCount=3 -->
+          <!-- SubstCount=2 -->
+          <Coverage index="0" Format="1">
+            <Glyph value="glyph00002"/>
+          </Coverage>
+          <Coverage index="1" Format="1">
+            <Glyph value="glyph00004"/>
+          </Coverage>
+          <Coverage index="2" Format="1">
+            <Glyph value="glyph00005"/>
+          </Coverage>
+          <SubstLookupRecord index="0">
+            <SequenceIndex value="0"/>
+            <LookupListIndex value="5"/>
+          </SubstLookupRecord>
+          <SubstLookupRecord index="1">
+            <SequenceIndex value="2"/>
+            <LookupListIndex value="5"/>
+          </SubstLookupRecord>
+        </ContextSubst>
+        <ContextSubst index="1" Format="3">
+          <!-- GlyphCount=2 -->
+          <!-- SubstCount=2 -->
+          <Coverage index="0" Format="1">
+            <Glyph value="glyph00002"/>
+          </Coverage>
+          <Coverage index="1" Format="1">
+            <Glyph value="glyph00005"/>
+          </Coverage>
+          <SubstLookupRecord index="0">
+            <SequenceIndex value="0"/>
+            <LookupListIndex value="5"/>
+          </SubstLookupRecord>
+          <SubstLookupRecord index="1">
+            <SequenceIndex value="1"/>
+            <LookupListIndex value="5"/>
+          </SubstLookupRecord>
+        </ContextSubst>
+      </Lookup>
+      <Lookup index="2">
+        <LookupType value="1"/>
+        <LookupFlag value="0"/>
+        <!-- SubTableCount=1 -->
+        <SingleSubst index="0" Format="1">
+          <Substitution in="plus" out="glyph00005"/>
+        </SingleSubst>
+      </Lookup>
+      <Lookup index="3">
+        <LookupType value="1"/>
+        <LookupFlag value="0"/>
+        <!-- SubTableCount=1 -->
+        <SingleSubst index="0" Format="1">
+          <Substitution in="plus" out="glyph00004"/>
+        </SingleSubst>
+      </Lookup>
+      <Lookup index="4">
+        <LookupType value="1"/>
+        <LookupFlag value="0"/>
+        <!-- SubTableCount=1 -->
+        <SingleSubst index="0" Format="1">
+          <Substitution in="plus" out="glyph00002"/>
+        </SingleSubst>
+      </Lookup>
+      <Lookup index="5">
+        <LookupType value="1"/>
+        <LookupFlag value="0"/>
+        <!-- SubTableCount=1 -->
+        <SingleSubst index="0" Format="2">
+          <Substitution in="glyph00002" out="glyph00003"/>
+          <Substitution in="glyph00005" out="glyph00006"/>
+          <Substitution in="plus" out="glyph00007"/>
+        </SingleSubst>
+      </Lookup>
+    </LookupList>
+  </GSUB>
+
+</ttFont>
diff --git a/Tests/subset/subset_test.py b/Tests/subset/subset_test.py
index 2493daff..2cce9baf 100644
--- a/Tests/subset/subset_test.py
+++ b/Tests/subset/subset_test.py
@@ -56,7 +56,7 @@ class SubsetTest(unittest.TestCase):
                     lines.append(line.rstrip() + os.linesep)
         return lines
 
-    def expect_ttx(self, font, expected_ttx, tables):
+    def expect_ttx(self, font, expected_ttx, tables=None):
         path = self.temp_path(suffix=".ttx")
         font.saveXML(path, tables=tables)
         actual = self.read_ttx(path)
@@ -732,6 +732,17 @@ class SubsetTest(unittest.TestCase):
 
         self.assertEqual(ttf.flavor, None)
 
+    def test_subset_context_subst_format_3(self):
+        # https://github.com/fonttools/fonttools/issues/1879
+        # Test font contains 'calt' feature with Format 3 ContextSubst lookup subtables
+        ttx = self.getpath("TestContextSubstFormat3.ttx")
+        font, fontpath = self.compile_font(ttx, ".ttf")
+        subsetpath = self.temp_path(".ttf")
+        subset.main([fontpath, "--unicodes=*", "--output-file=%s" % subsetpath])
+        subsetfont = TTFont(subsetpath)
+        # check all glyphs are kept via GSUB closure, no changes expected
+        self.expect_ttx(subsetfont, ttx)
+
 
 @pytest.fixture
 def featureVarsTestFont():
diff --git a/Tests/ttLib/tables/_g_v_a_r_test.py b/Tests/ttLib/tables/_g_v_a_r_test.py
index 6de6e247..9a00fded 100644
--- a/Tests/ttLib/tables/_g_v_a_r_test.py
+++ b/Tests/ttLib/tables/_g_v_a_r_test.py
@@ -81,15 +81,6 @@ GVAR_VARIATIONS = {
 GVAR_XML = [
     '<version value="1"/>',
     '<reserved value="0"/>',
-    '<glyphVariations glyph="space">',
-    '  <tuple>',
-    '    <coord axis="wdth" value="0.7"/>',
-    '    <delta pt="0" x="1" y="11"/>',
-    '    <delta pt="1" x="2" y="22"/>',
-    '    <delta pt="2" x="3" y="33"/>',
-    '    <delta pt="3" x="4" y="44"/>',
-    '  </tuple>',
-    '</glyphVariations>',
     '<glyphVariations glyph="I">',
     '  <tuple>',
     '    <coord axis="wght" min="0.0" value="0.5" max="1.0"/>',
@@ -113,6 +104,15 @@ GVAR_XML = [
     '    <delta pt="7" x="1" y="11"/>',
     '  </tuple>',
     '</glyphVariations>',
+    '<glyphVariations glyph="space">',
+    '  <tuple>',
+    '    <coord axis="wdth" value="0.7"/>',
+    '    <delta pt="0" x="1" y="11"/>',
+    '    <delta pt="1" x="2" y="22"/>',
+    '    <delta pt="2" x="3" y="33"/>',
+    '    <delta pt="3" x="4" y="44"/>',
+    '  </tuple>',
+    '</glyphVariations>',
 ]
 
 
diff --git a/Tests/ttLib/tables/_m_e_t_a_test.py b/Tests/ttLib/tables/_m_e_t_a_test.py
index 4f0a4158..3a4f2f5b 100644
--- a/Tests/ttLib/tables/_m_e_t_a_test.py
+++ b/Tests/ttLib/tables/_m_e_t_a_test.py
@@ -58,6 +58,19 @@ class MetaTableTest(unittest.TestCase):
             '</hexdata>'
         ], [line.strip() for line in xml.splitlines()][1:])
 
+    def test_toXML_ascii_data(self):
+        table = table__m_e_t_a()
+        table.data["TEST"] = b"Hello!"
+        writer = XMLWriter(BytesIO())
+        table.toXML(writer, {"meta": table})
+        xml = writer.file.getvalue().decode("utf-8")
+        self.assertEqual([
+            '<hexdata tag="TEST">',
+                '<!-- ascii: Hello! -->',
+                '48656c6c 6f21',
+            '</hexdata>'
+        ], [line.strip() for line in xml.splitlines()][1:])
+
     def test_fromXML(self):
         table = table__m_e_t_a()
         for name, attrs, content in parseXML(
diff --git a/Tests/ttLib/tables/_n_a_m_e_test.py b/Tests/ttLib/tables/_n_a_m_e_test.py
index d770a523..5f5c965c 100644
--- a/Tests/ttLib/tables/_n_a_m_e_test.py
+++ b/Tests/ttLib/tables/_n_a_m_e_test.py
@@ -144,6 +144,48 @@ class NameTableTest(unittest.TestCase):
 		rec2 = table.getName(2, 1, 0, 0)
 		self.assertEqual(str(rec2), "Regular")
 
+	@staticmethod
+	def _get_test_names():
+		names = {
+			"en": "Width",
+			"de-CH": "Breite",
+			"gsw-LI": "Bräiti",
+		}
+		namesSubSet = names.copy()
+		del namesSubSet["gsw-LI"]
+		namesSuperSet = names.copy()
+		namesSuperSet["nl"] = "Breedte"
+		return names, namesSubSet, namesSuperSet
+
+	def test_findMultilingualName(self):
+		table = table__n_a_m_e()
+		names, namesSubSet, namesSuperSet = self._get_test_names()
+		nameID = table.addMultilingualName(names)
+		assert nameID is not None
+		self.assertEqual(nameID, table.findMultilingualName(names))
+		self.assertEqual(nameID, table.findMultilingualName(namesSubSet))
+		self.assertEqual(None, table.findMultilingualName(namesSuperSet))
+
+	def test_addMultilingualNameReuse(self):
+		table = table__n_a_m_e()
+		names, namesSubSet, namesSuperSet = self._get_test_names()
+		nameID = table.addMultilingualName(names)
+		assert nameID is not None
+		self.assertEqual(nameID, table.addMultilingualName(names))
+		self.assertEqual(nameID, table.addMultilingualName(namesSubSet))
+		self.assertNotEqual(None, table.addMultilingualName(namesSuperSet))
+
+	def test_findMultilingualNameNoMac(self):
+		table = table__n_a_m_e()
+		names, namesSubSet, namesSuperSet = self._get_test_names()
+		nameID = table.addMultilingualName(names, mac=False)
+		assert nameID is not None
+		self.assertEqual(nameID, table.findMultilingualName(names, mac=False))
+		self.assertEqual(None, table.findMultilingualName(names))
+		self.assertEqual(nameID, table.findMultilingualName(namesSubSet, mac=False))
+		self.assertEqual(None, table.findMultilingualName(namesSubSet))
+		self.assertEqual(None, table.findMultilingualName(namesSuperSet))
+
 	def test_addMultilingualName(self):
 		# Microsoft Windows has language codes for “English” (en)
 		# and for “Standard German as used in Switzerland” (de-CH).
diff --git a/Tests/ufoLib/glifLib_test.py b/Tests/ufoLib/glifLib_test.py
index a29c76bf..0b12a064 100644
--- a/Tests/ufoLib/glifLib_test.py
+++ b/Tests/ufoLib/glifLib_test.py
@@ -1,3 +1,4 @@
+import logging
 import os
 import tempfile
 import shutil
@@ -7,7 +8,9 @@ from .testSupport import getDemoFontGlyphSetPath
 from fontTools.ufoLib.glifLib import (
 	GlyphSet, glyphNameToFileName, readGlyphFromString, writeGlyphToString,
 )
+from fontTools.ufoLib.errors import GlifLibError, UnsupportedGLIFFormat, UnsupportedUFOFormat
 from fontTools.misc.etree import XML_DECLARATION
+import pytest
 
 GLYPHSETDIR = getDemoFontGlyphSetPath()
 
@@ -142,9 +145,9 @@ class _Glyph:
 	pass
 
 
-class ReadWriteFuncTest(unittest.TestCase):
+class ReadWriteFuncTest:
 
-	def testRoundTrip(self):
+	def test_roundtrip(self):
 		glyph = _Glyph()
 		glyph.name = "a"
 		glyph.unicodes = [0x0061]
@@ -153,29 +156,105 @@ class ReadWriteFuncTest(unittest.TestCase):
 
 		glyph2 = _Glyph()
 		readGlyphFromString(s1, glyph2)
-		self.assertEqual(glyph.__dict__, glyph2.__dict__)
+		assert glyph.__dict__ == glyph2.__dict__
 
 		s2 = writeGlyphToString(glyph2.name, glyph2)
-		self.assertEqual(s1, s2)
+		assert s1 == s2
 
-	def testXmlDeclaration(self):
+	def test_xml_declaration(self):
 		s = writeGlyphToString("a", _Glyph())
-		self.assertTrue(s.startswith(XML_DECLARATION % "UTF-8"))
+		assert s.startswith(XML_DECLARATION % "UTF-8")
+
+	def test_parse_xml_remove_comments(self):
+		s = b"""<?xml version='1.0' encoding='UTF-8'?>
+		<!-- a comment -->
+		<glyph name="A" format="2">
+			<advance width="1290"/>
+			<unicode hex="0041"/>
+			<!-- another comment -->
+		</glyph>
+		"""
+
+		g = _Glyph()
+		readGlyphFromString(s, g)
+
+		assert g.name == "A"
+		assert g.width == 1290
+		assert g.unicodes == [0x0041]
+
+	def test_read_unsupported_format_version(self, caplog):
+		s = """<?xml version='1.0' encoding='utf-8'?>
+		<glyph name="A" format="0" formatMinor="0">
+			<advance width="500"/>
+			<unicode hex="0041"/>
+		</glyph>
+		"""
+
+		with pytest.raises(UnsupportedGLIFFormat):
+			readGlyphFromString(s, _Glyph())  # validate=True by default
+
+		with pytest.raises(UnsupportedGLIFFormat):
+			readGlyphFromString(s, _Glyph(), validate=True)
+
+		caplog.clear()
+		with caplog.at_level(logging.WARNING, logger="fontTools.ufoLib.glifLib"):
+			readGlyphFromString(s, _Glyph(), validate=False)
+
+		assert len(caplog.records) == 1
+		assert "Unsupported GLIF format" in caplog.text
+		assert "Assuming the latest supported version" in caplog.text
+
+	def test_read_allow_format_versions(self):
+		s = """<?xml version='1.0' encoding='utf-8'?>
+		<glyph name="A" format="2">
+			<advance width="500"/>
+			<unicode hex="0041"/>
+		</glyph>
+		"""
+
+		# these two calls are are equivalent
+		readGlyphFromString(s, _Glyph(), formatVersions=[1, 2])
+		readGlyphFromString(s, _Glyph(), formatVersions=[(1, 0), (2, 0)])
+
+		# if at least one supported formatVersion, unsupported ones are ignored
+		readGlyphFromString(s, _Glyph(), formatVersions=[(2, 0), (123, 456)])
+
+		with pytest.raises(
+			ValueError,
+			match="None of the requested GLIF formatVersions are supported"
+		):
+			readGlyphFromString(s, _Glyph(), formatVersions=[0, 2001])
+
+		with pytest.raises(GlifLibError, match="Forbidden GLIF format version"):
+			readGlyphFromString(s, _Glyph(), formatVersions=[1])
+
+
+def test_GlyphSet_unsupported_ufoFormatVersion(tmp_path, caplog):
+	with pytest.raises(UnsupportedUFOFormat):
+		GlyphSet(tmp_path, ufoFormatVersion=0)
+	with pytest.raises(UnsupportedUFOFormat):
+		GlyphSet(tmp_path, ufoFormatVersion=(0, 1))
+
 
+def test_GlyphSet_writeGlyph_formatVersion(tmp_path):
+	src = GlyphSet(GLYPHSETDIR)
+	dst = GlyphSet(tmp_path, ufoFormatVersion=(2, 0))
+	glyph = src["A"]
 
-def test_parse_xml_remove_comments():
-	s = b"""<?xml version='1.0' encoding='UTF-8'?>
-	<!-- a comment -->
-	<glyph name="A" format="2">
-		<advance width="1290"/>
-		<unicode hex="0041"/>
-		<!-- another comment -->
-	</glyph>
-	"""
+	# no explicit formatVersion passed: use the more recent GLIF formatVersion
+	# that is supported by given ufoFormatVersion (GLIF 1 for UFO 2)
+	dst.writeGlyph("A", glyph)
+	glif = dst.getGLIF("A")
+	assert b'format="1"' in glif
+	assert b'formatMinor' not in glif  # omitted when 0
 
-	g = _Glyph()
-	readGlyphFromString(s, g)
+	# explicit, unknown formatVersion
+	with pytest.raises(UnsupportedGLIFFormat):
+		dst.writeGlyph("A", glyph, formatVersion=(0, 0))
 
-	assert g.name == "A"
-	assert g.width == 1290
-	assert g.unicodes == [0x0041]
+	# explicit, known formatVersion but unsupported by given ufoFormatVersion
+	with pytest.raises(
+		UnsupportedGLIFFormat,
+		match="Unsupported GLIF format version .*for UFO format version",
+	):
+		dst.writeGlyph("A", glyph, formatVersion=(2, 0))
diff --git a/Tests/ufoLib/ufoLib_test.py b/Tests/ufoLib/ufoLib_test.py
new file mode 100644
index 00000000..430e7a7d
--- /dev/null
+++ b/Tests/ufoLib/ufoLib_test.py
@@ -0,0 +1,98 @@
+import logging
+import shutil
+
+from fontTools.misc import plistlib
+from fontTools.ufoLib import UFOReader, UFOWriter, UFOFormatVersion
+from fontTools.ufoLib.errors import UFOLibError, UnsupportedUFOFormat
+import pytest
+
+
+@pytest.fixture
+def ufo_path(tmp_path):
+    ufodir = tmp_path / "TestFont.ufo"
+    ufodir.mkdir()
+    with (ufodir / "metainfo.plist").open("wb") as f:
+        plistlib.dump({"creator": "pytest", "formatVersion": 3}, f)
+    (ufodir / "glyphs").mkdir()
+    with (ufodir / "layercontents.plist").open("wb") as f:
+        plistlib.dump([("public.default", "glyphs")], f)
+    return ufodir
+
+
+def test_formatVersion_deprecated(ufo_path):
+    reader = UFOReader(ufo_path)
+
+    with pytest.warns(DeprecationWarning) as warnings:
+        assert reader.formatVersion == 3
+
+    assert len(warnings) == 1
+    assert "is deprecated; use the 'formatVersionTuple'" in warnings[0].message.args[0]
+
+
+def test_formatVersionTuple(ufo_path):
+    reader = UFOReader(ufo_path)
+
+    assert reader.formatVersionTuple == (3, 0)
+    assert reader.formatVersionTuple.major == 3
+    assert reader.formatVersionTuple.minor == 0
+    assert str(reader.formatVersionTuple) == "3.0"
+
+
+def test_readMetaInfo_errors(ufo_path):
+    (ufo_path / "metainfo.plist").unlink()
+    with pytest.raises(UFOLibError, match="'metainfo.plist' is missing"):
+        UFOReader(ufo_path)
+
+    (ufo_path / "metainfo.plist").write_bytes(plistlib.dumps({}))
+    with pytest.raises(UFOLibError, match="Missing required formatVersion"):
+        UFOReader(ufo_path)
+
+    (ufo_path / "metainfo.plist").write_bytes(plistlib.dumps([]))
+    with pytest.raises(UFOLibError, match="metainfo.plist is not properly formatted"):
+        UFOReader(ufo_path)
+
+
+def test_readMetaInfo_unsupported_format_version(ufo_path, caplog):
+    metainfo = {"formatVersion": 10, "formatVersionMinor": 15}
+    (ufo_path / "metainfo.plist").write_bytes(plistlib.dumps(metainfo))
+
+    with pytest.raises(UnsupportedUFOFormat):
+        UFOReader(ufo_path)  # validate=True by default
+
+    with pytest.raises(UnsupportedUFOFormat):
+        UFOReader(ufo_path, validate=True)
+
+    caplog.clear()
+    with caplog.at_level(logging.WARNING, logger="fontTools.ufoLib"):
+        UFOReader(ufo_path, validate=False)
+
+    assert len(caplog.records) == 1
+    assert "Unsupported UFO format" in caplog.text
+    assert "Assuming the latest supported version" in caplog.text
+
+
+def test_UFOWriter_formatVersion(tmp_path):
+    ufo_path = tmp_path / "TestFont.ufo"
+    with UFOWriter(ufo_path, formatVersion=3) as writer:
+        assert writer.formatVersionTuple == (3, 0)
+
+    shutil.rmtree(str(ufo_path))
+    with UFOWriter(ufo_path, formatVersion=(2, 0)) as writer:
+        assert writer.formatVersionTuple == (2, 0)
+
+
+def test_UFOWriter_formatVersion_default_latest(tmp_path):
+    writer = UFOWriter(tmp_path / "TestFont.ufo")
+    assert writer.formatVersionTuple == UFOFormatVersion.default()
+
+
+def test_UFOWriter_unsupported_format_version(tmp_path):
+    with pytest.raises(UnsupportedUFOFormat):
+        UFOWriter(tmp_path, formatVersion=(123, 456))
+
+
+def test_UFOWriter_previous_higher_format_version(ufo_path):
+    with pytest.raises(
+        UnsupportedUFOFormat, match="UFO located at this path is a higher version"
+    ):
+        UFOWriter(ufo_path, formatVersion=(2, 0))
diff --git a/Tests/varLib/data/FeatureVarsWholeRange.designspace b/Tests/varLib/data/FeatureVarsWholeRange.designspace
new file mode 100644
index 00000000..2d8802cf
--- /dev/null
+++ b/Tests/varLib/data/FeatureVarsWholeRange.designspace
@@ -0,0 +1,34 @@
+<?xml version='1.0' encoding='utf-8'?>
+<designspace format="3">
+    <axes>
+        <axis default="368.0" maximum="1000.0" minimum="0.0" name="weight" tag="wght" />
+    </axes>
+    <rules processing="last">
+        <rule name="always">
+            <conditionset>
+                <condition name="weight" minimum="0" maximum="1000" />
+            </conditionset>
+            <sub name="uni0024" with="uni0024.nostroke" />
+        </rule>
+    </rules>
+    <sources>
+        <source familyname="Test Family" filename="master_ufo/TestFamily-Master0.ufo" name="master_0" stylename="Master0">
+            <location>
+                <dimension name="weight" xvalue="0" />
+            </location>
+        </source>
+        <source familyname="Test Family" filename="master_ufo/TestFamily-Master1.ufo" name="master_1" stylename="Master1">
+            <lib copy="1" />
+            <groups copy="1" />
+            <info copy="1" />
+            <location>
+                <dimension name="weight" xvalue="368" />
+            </location>
+        </source>
+        <source familyname="Test Family" filename="master_ufo/TestFamily-Master3.ufo" name="master_3" stylename="Master3">
+            <location>
+                <dimension name="weight" xvalue="1000" />
+            </location>
+        </source>
+    </sources>
+</designspace>
diff --git a/Tests/varLib/data/FeatureVarsWholeRangeEmpty.designspace b/Tests/varLib/data/FeatureVarsWholeRangeEmpty.designspace
new file mode 100644
index 00000000..a692daa6
--- /dev/null
+++ b/Tests/varLib/data/FeatureVarsWholeRangeEmpty.designspace
@@ -0,0 +1,33 @@
+<?xml version='1.0' encoding='utf-8'?>
+<designspace format="3">
+    <axes>
+        <axis default="368.0" maximum="1000.0" minimum="0.0" name="weight" tag="wght" />
+    </axes>
+    <rules processing="last">
+        <rule name="always">
+            <conditionset>
+            </conditionset>
+            <sub name="uni0024" with="uni0024.nostroke" />
+        </rule>
+    </rules>
+    <sources>
+        <source familyname="Test Family" filename="master_ufo/TestFamily-Master0.ufo" name="master_0" stylename="Master0">
+            <location>
+                <dimension name="weight" xvalue="0" />
+            </location>
+        </source>
+        <source familyname="Test Family" filename="master_ufo/TestFamily-Master1.ufo" name="master_1" stylename="Master1">
+            <lib copy="1" />
+            <groups copy="1" />
+            <info copy="1" />
+            <location>
+                <dimension name="weight" xvalue="368" />
+            </location>
+        </source>
+        <source familyname="Test Family" filename="master_ufo/TestFamily-Master3.ufo" name="master_3" stylename="Master3">
+            <location>
+                <dimension name="weight" xvalue="1000" />
+            </location>
+        </source>
+    </sources>
+</designspace>
diff --git a/Tests/varLib/data/test_results/Build.ttx b/Tests/varLib/data/test_results/Build.ttx
index 6e9c6e37..5a406c84 100644
--- a/Tests/varLib/data/test_results/Build.ttx
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diff --git a/Tests/varLib/data/test_results/BuildMain.ttx b/Tests/varLib/data/test_results/BuildMain.ttx
index 7e5d9561..20add49e 100644
--- a/Tests/varLib/data/test_results/BuildMain.ttx
+++ b/Tests/varLib/data/test_results/BuildMain.ttx
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+        <delta pt="60" x="-25" y="-13"/>
+        <delta pt="61" x="0" y="0"/>
+        <delta pt="62" x="32" y="0"/>
+        <delta pt="63" x="0" y="0"/>
+        <delta pt="64" x="0" y="0"/>
+      </tuple>
+      <tuple>
+        <coord axis="cntr" value="1.0"/>
+        <delta pt="0" x="0" y="-3"/>
+        <delta pt="1" x="0" y="-1"/>
+        <delta pt="2" x="0" y="-3"/>
+        <delta pt="3" x="0" y="-3"/>
+        <delta pt="4" x="0" y="-3"/>
+        <delta pt="5" x="0" y="-3"/>
+        <delta pt="6" x="0" y="-3"/>
+        <delta pt="7" x="0" y="4"/>
+        <delta pt="8" x="0" y="4"/>
+        <delta pt="9" x="2" y="5"/>
+        <delta pt="10" x="6" y="7"/>
+        <delta pt="11" x="1" y="5"/>
+        <delta pt="12" x="0" y="-1"/>
+        <delta pt="13" x="0" y="-6"/>
+        <delta pt="14" x="0" y="-6"/>
+        <delta pt="15" x="-1" y="-6"/>
+        <delta pt="16" x="0" y="-6"/>
+        <delta pt="17" x="0" y="-6"/>
+        <delta pt="18" x="0" y="-5"/>
+        <delta pt="19" x="0" y="-4"/>
+        <delta pt="20" x="0" y="-1"/>
+        <delta pt="21" x="0" y="0"/>
+        <delta pt="22" x="0" y="0"/>
+        <delta pt="23" x="0" y="0"/>
+        <delta pt="24" x="0" y="0"/>
+        <delta pt="25" x="0" y="0"/>
+        <delta pt="26" x="0" y="0"/>
+        <delta pt="27" x="0" y="-1"/>
+        <delta pt="28" x="0" y="-2"/>
+        <delta pt="29" x="0" y="7"/>
+        <delta pt="30" x="0" y="6"/>
+        <delta pt="31" x="0" y="7"/>
+        <delta pt="32" x="0" y="7"/>
+        <delta pt="33" x="0" y="7"/>
+        <delta pt="34" x="0" y="7"/>
+        <delta pt="35" x="0" y="7"/>
+        <delta pt="36" x="0" y="0"/>
+        <delta pt="37" x="0" y="0"/>
+        <delta pt="38" x="0" y="0"/>
+        <delta pt="39" x="0" y="0"/>
+        <delta pt="40" x="0" y="0"/>
+        <delta pt="41" x="0" y="0"/>
+        <delta pt="42" x="0" y="0"/>
+        <delta pt="43" x="0" y="0"/>
+        <delta pt="44" x="0" y="0"/>
+        <delta pt="45" x="0" y="0"/>
+        <delta pt="46" x="0" y="0"/>
+        <delta pt="47" x="0" y="0"/>
+        <delta pt="48" x="0" y="0"/>
+        <delta pt="49" x="0" y="-6"/>
+        <delta pt="50" x="0" y="-7"/>
+        <delta pt="51" x="0" y="-8"/>
+        <delta pt="52" x="0" y="-8"/>
+        <delta pt="53" x="1" y="-8"/>
+        <delta pt="54" x="2" y="-5"/>
+        <delta pt="55" x="4" y="-2"/>
+        <delta pt="56" x="0" y="0"/>
+        <delta pt="57" x="0" y="0"/>
+        <delta pt="58" x="0" y="0"/>
+        <delta pt="59" x="0" y="0"/>
+        <delta pt="60" x="0" y="-1"/>
+        <delta pt="61" x="0" y="0"/>
+        <delta pt="62" x="0" y="0"/>
+        <delta pt="63" x="0" y="0"/>
+        <delta pt="64" x="0" y="0"/>
+      </tuple>
+      <tuple>
+        <coord axis="wght" value="-1.0"/>
+        <coord axis="cntr" value="1.0"/>
+        <delta pt="0" x="0" y="3"/>
+        <delta pt="1" x="0" y="1"/>
+        <delta pt="2" x="0" y="3"/>
+        <delta pt="3" x="0" y="3"/>
+        <delta pt="4" x="0" y="3"/>
+        <delta pt="5" x="0" y="3"/>
+        <delta pt="6" x="0" y="3"/>
+        <delta pt="7" x="0" y="-4"/>
+        <delta pt="8" x="0" y="-4"/>
+        <delta pt="9" x="-2" y="-5"/>
+        <delta pt="10" x="-6" y="-7"/>
+        <delta pt="11" x="-1" y="-5"/>
+        <delta pt="12" x="0" y="1"/>
+        <delta pt="13" x="0" y="6"/>
+        <delta pt="14" x="0" y="6"/>
+        <delta pt="15" x="1" y="6"/>
+        <delta pt="16" x="0" y="6"/>
+        <delta pt="17" x="0" y="6"/>
+        <delta pt="18" x="0" y="5"/>
+        <delta pt="19" x="0" y="4"/>
+        <delta pt="20" x="0" y="1"/>
+        <delta pt="21" x="0" y="0"/>
+        <delta pt="22" x="0" y="0"/>
+        <delta pt="23" x="0" y="0"/>
+        <delta pt="24" x="0" y="0"/>
+        <delta pt="25" x="0" y="0"/>
+        <delta pt="26" x="0" y="0"/>
+        <delta pt="27" x="0" y="1"/>
+        <delta pt="28" x="0" y="2"/>
+        <delta pt="29" x="0" y="-7"/>
+        <delta pt="30" x="0" y="-6"/>
+        <delta pt="31" x="0" y="-7"/>
+        <delta pt="32" x="0" y="-7"/>
+        <delta pt="33" x="0" y="-7"/>
+        <delta pt="34" x="0" y="-7"/>
+        <delta pt="35" x="0" y="-7"/>
+        <delta pt="36" x="0" y="0"/>
+        <delta pt="37" x="0" y="0"/>
+        <delta pt="38" x="0" y="0"/>
+        <delta pt="39" x="0" y="0"/>
+        <delta pt="40" x="0" y="0"/>
+        <delta pt="41" x="0" y="0"/>
+        <delta pt="42" x="0" y="0"/>
+        <delta pt="43" x="0" y="0"/>
+        <delta pt="44" x="0" y="0"/>
+        <delta pt="45" x="0" y="0"/>
+        <delta pt="46" x="0" y="0"/>
+        <delta pt="47" x="0" y="0"/>
+        <delta pt="48" x="0" y="0"/>
+        <delta pt="49" x="0" y="6"/>
+        <delta pt="50" x="0" y="7"/>
+        <delta pt="51" x="0" y="8"/>
+        <delta pt="52" x="0" y="8"/>
+        <delta pt="53" x="-1" y="8"/>
+        <delta pt="54" x="-2" y="5"/>
+        <delta pt="55" x="-4" y="2"/>
+        <delta pt="56" x="0" y="0"/>
+        <delta pt="57" x="0" y="0"/>
+        <delta pt="58" x="0" y="0"/>
+        <delta pt="59" x="0" y="0"/>
+        <delta pt="60" x="0" y="1"/>
+        <delta pt="61" x="0" y="0"/>
+        <delta pt="62" x="0" y="0"/>
+        <delta pt="63" x="0" y="0"/>
+        <delta pt="64" x="0" y="0"/>
+      </tuple>
+      <tuple>
+        <coord axis="wght" value="1.0"/>
+        <coord axis="cntr" value="1.0"/>
+        <delta pt="0" x="0" y="-5"/>
+        <delta pt="1" x="0" y="0"/>
+        <delta pt="2" x="3" y="-4"/>
+        <delta pt="3" x="0" y="-4"/>
+        <delta pt="4" x="0" y="-4"/>
+        <delta pt="5" x="0" y="-4"/>
+        <delta pt="6" x="0" y="-4"/>
+        <delta pt="7" x="0" y="8"/>
+        <delta pt="8" x="0" y="8"/>
+        <delta pt="9" x="5" y="9"/>
+        <delta pt="10" x="11" y="13"/>
+        <delta pt="11" x="2" y="10"/>
+        <delta pt="12" x="0" y="0"/>
+        <delta pt="13" x="0" y="-9"/>
+        <delta pt="14" x="0" y="-9"/>
+        <delta pt="15" x="-1" y="-9"/>
+        <delta pt="16" x="0" y="-9"/>
+        <delta pt="17" x="0" y="-9"/>
+        <delta pt="18" x="0" y="-10"/>
+        <delta pt="19" x="0" y="-8"/>
+        <delta pt="20" x="0" y="-2"/>
+        <delta pt="21" x="0" y="1"/>
+        <delta pt="22" x="0" y="0"/>
+        <delta pt="23" x="1" y="-1"/>
+        <delta pt="24" x="0" y="0"/>
+        <delta pt="25" x="0" y="0"/>
+        <delta pt="26" x="0" y="0"/>
+        <delta pt="27" x="0" y="-1"/>
+        <delta pt="28" x="0" y="-4"/>
+        <delta pt="29" x="0" y="12"/>
+        <delta pt="30" x="0" y="13"/>
+        <delta pt="31" x="0" y="13"/>
+        <delta pt="32" x="0" y="13"/>
+        <delta pt="33" x="0" y="13"/>
+        <delta pt="34" x="0" y="13"/>
+        <delta pt="35" x="0" y="13"/>
+        <delta pt="36" x="0" y="0"/>
+        <delta pt="37" x="0" y="0"/>
+        <delta pt="38" x="0" y="0"/>
+        <delta pt="39" x="0" y="1"/>
+        <delta pt="40" x="0" y="1"/>
+        <delta pt="41" x="0" y="1"/>
+        <delta pt="42" x="0" y="1"/>
+        <delta pt="43" x="0" y="0"/>
+        <delta pt="44" x="0" y="0"/>
+        <delta pt="45" x="0" y="0"/>
+        <delta pt="46" x="0" y="0"/>
+        <delta pt="47" x="0" y="-1"/>
+        <delta pt="48" x="0" y="-1"/>
+        <delta pt="49" x="0" y="-9"/>
+        <delta pt="50" x="0" y="-13"/>
+        <delta pt="51" x="1" y="-14"/>
+        <delta pt="52" x="1" y="-14"/>
+        <delta pt="53" x="2" y="-14"/>
+        <delta pt="54" x="5" y="-11"/>
+        <delta pt="55" x="7" y="-4"/>
+        <delta pt="56" x="0" y="0"/>
+        <delta pt="57" x="0" y="0"/>
+        <delta pt="58" x="0" y="0"/>
+        <delta pt="59" x="0" y="0"/>
+        <delta pt="60" x="1" y="0"/>
+        <delta pt="61" x="0" y="0"/>
+        <delta pt="62" x="0" y="0"/>
+        <delta pt="63" x="0" y="0"/>
+        <delta pt="64" x="0" y="0"/>
+      </tuple>
+    </glyphVariations>
   </gvar>
 
   <ltag>
diff --git a/Tests/varLib/data/test_results/FeatureVarsWholeRange.ttx b/Tests/varLib/data/test_results/FeatureVarsWholeRange.ttx
new file mode 100644
index 00000000..8e098b9b
--- /dev/null
+++ b/Tests/varLib/data/test_results/FeatureVarsWholeRange.ttx
@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ttFont sfntVersion="\x00\x01\x00\x00" ttLibVersion="4.9">
+
+  <fvar>
+
+    <!-- Weight -->
+    <Axis>
+      <AxisTag>wght</AxisTag>
+      <Flags>0x0</Flags>
+      <MinValue>0.0</MinValue>
+      <DefaultValue>368.0</DefaultValue>
+      <MaxValue>1000.0</MaxValue>
+      <AxisNameID>256</AxisNameID>
+    </Axis>
+  </fvar>
+
+  <GSUB>
+    <Version value="0x00010001"/>
+    <ScriptList>
+      <!-- ScriptCount=1 -->
+      <ScriptRecord index="0">
+        <ScriptTag value="DFLT"/>
+        <Script>
+          <DefaultLangSys>
+            <ReqFeatureIndex value="65535"/>
+            <!-- FeatureCount=1 -->
+            <FeatureIndex index="0" value="0"/>
+          </DefaultLangSys>
+          <!-- LangSysCount=0 -->
+        </Script>
+      </ScriptRecord>
+    </ScriptList>
+    <FeatureList>
+      <!-- FeatureCount=1 -->
+      <FeatureRecord index="0">
+        <FeatureTag value="rclt"/>
+        <Feature>
+          <!-- LookupCount=0 -->
+        </Feature>
+      </FeatureRecord>
+    </FeatureList>
+    <LookupList>
+      <!-- LookupCount=1 -->
+      <Lookup index="0">
+        <LookupType value="1"/>
+        <LookupFlag value="0"/>
+        <!-- SubTableCount=1 -->
+        <SingleSubst index="0" Format="1">
+          <Substitution in="uni0024" out="uni0024.nostroke"/>
+        </SingleSubst>
+      </Lookup>
+    </LookupList>
+    <FeatureVariations>
+      <Version value="0x00010000"/>
+      <!-- FeatureVariationCount=1 -->
+      <FeatureVariationRecord index="0">
+        <ConditionSet>
+          <!-- ConditionCount=0 -->
+        </ConditionSet>
+        <FeatureTableSubstitution>
+          <Version value="0x00010000"/>
+          <!-- SubstitutionCount=1 -->
+          <SubstitutionRecord index="0">
+            <FeatureIndex value="0"/>
+            <Feature>
+              <!-- LookupCount=1 -->
+              <LookupListIndex index="0" value="0"/>
+            </Feature>
+          </SubstitutionRecord>
+        </FeatureTableSubstitution>
+      </FeatureVariationRecord>
+    </FeatureVariations>
+  </GSUB>
+
+</ttFont>
diff --git a/Tests/varLib/data/test_results/SparseMasters.ttx b/Tests/varLib/data/test_results/SparseMasters.ttx
index c2aa335c..fb9cb46d 100644
--- a/Tests/varLib/data/test_results/SparseMasters.ttx
+++ b/Tests/varLib/data/test_results/SparseMasters.ttx
@@ -572,6 +572,19 @@
         <delta pt="21" x="0" y="0"/>
       </tuple>
     </glyphVariations>
+    <glyphVariations glyph="dotabovecomb">
+      <tuple>
+        <coord axis="wght" value="1.0"/>
+        <delta pt="0" x="-8" y="28"/>
+        <delta pt="1" x="13" y="16"/>
+        <delta pt="2" x="17" y="-13"/>
+        <delta pt="3" x="-27" y="-20"/>
+        <delta pt="4" x="0" y="0"/>
+        <delta pt="5" x="0" y="0"/>
+        <delta pt="6" x="0" y="0"/>
+        <delta pt="7" x="0" y="0"/>
+      </tuple>
+    </glyphVariations>
     <glyphVariations glyph="e">
       <tuple>
         <coord axis="wght" min="0.0" value="0.36365" max="1.0"/>
@@ -614,6 +627,12 @@
         <delta pt="16" x="0" y="0"/>
       </tuple>
     </glyphVariations>
+    <glyphVariations glyph="edotabove">
+      <tuple>
+        <coord axis="wght" value="1.0"/>
+        <delta pt="1" x="-6" y="91"/>
+      </tuple>
+    </glyphVariations>
     <glyphVariations glyph="s">
       <tuple>
         <coord axis="wght" value="1.0"/>
@@ -635,25 +654,6 @@
         <delta pt="15" x="0" y="0"/>
       </tuple>
     </glyphVariations>
-    <glyphVariations glyph="dotabovecomb">
-      <tuple>
-        <coord axis="wght" value="1.0"/>
-        <delta pt="0" x="-8" y="28"/>
-        <delta pt="1" x="13" y="16"/>
-        <delta pt="2" x="17" y="-13"/>
-        <delta pt="3" x="-27" y="-20"/>
-        <delta pt="4" x="0" y="0"/>
-        <delta pt="5" x="0" y="0"/>
-        <delta pt="6" x="0" y="0"/>
-        <delta pt="7" x="0" y="0"/>
-      </tuple>
-    </glyphVariations>
-    <glyphVariations glyph="edotabove">
-      <tuple>
-        <coord axis="wght" value="1.0"/>
-        <delta pt="1" x="-6" y="91"/>
-      </tuple>
-    </glyphVariations>
   </gvar>
 
 </ttFont>
diff --git a/Tests/varLib/varLib_test.py b/Tests/varLib/varLib_test.py
index 2c95784a..5d36d687 100644
--- a/Tests/varLib/varLib_test.py
+++ b/Tests/varLib/varLib_test.py
@@ -218,6 +218,30 @@ class BuildTest(unittest.TestCase):
             save_before_dump=True,
         )
 
+    def test_varlib_build_feature_variations_whole_range(self):
+        """Designspace file contains <rules> element specifying the entire design
+        space, used to build GSUB FeatureVariations table.
+        """
+        self._run_varlib_build_test(
+            designspace_name="FeatureVarsWholeRange",
+            font_name="TestFamily",
+            tables=["fvar", "GSUB"],
+            expected_ttx_name="FeatureVarsWholeRange",
+            save_before_dump=True,
+        )
+
+    def test_varlib_build_feature_variations_whole_range_empty(self):
+        """Designspace file contains <rules> element without a condition, specifying
+        the entire design space, used to build GSUB FeatureVariations table.
+        """
+        self._run_varlib_build_test(
+            designspace_name="FeatureVarsWholeRangeEmpty",
+            font_name="TestFamily",
+            tables=["fvar", "GSUB"],
+            expected_ttx_name="FeatureVarsWholeRange",
+            save_before_dump=True,
+        )
+
     def test_varlib_build_feature_variations_with_existing_rclt(self):
         """Designspace file contains <rules> element, used to build GSUB
         FeatureVariations table. <rules> is specified to do its OT processing