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-rw-r--r--src/metadata.rs6
1 files changed, 3 insertions, 3 deletions
diff --git a/src/metadata.rs b/src/metadata.rs
index fc925de..3f940b0 100644
--- a/src/metadata.rs
+++ b/src/metadata.rs
@@ -19,11 +19,11 @@ fn normalize_key(key: &str, binary: bool) -> Result<Cow<'_, str>> {
let mut is_upper_case = false;
for b in key.as_bytes() {
let b = *b;
- if (b'A'..=b'Z').contains(&b) {
+ if b.is_ascii_uppercase() {
is_upper_case = true;
continue;
- } else if (b'a'..=b'z').contains(&b)
- || (b'0'..=b'9').contains(&b)
+ } else if b.is_ascii_lowercase()
+ || b.is_ascii_digit()
|| b == b'_'
|| b == b'-'
|| b == b'.'