pub fn parse_lowercase_hash(bytes: &[u8]) -> Option<Hash>Expand description
Strict lowercase-only hex parser: exactly HEX_LEN lowercase-hex
bytes, decoded in a single pass. SPEC-REFS §1 forbids uppercase on read;
the general hash::from_hex tolerates both cases for programmatic
callers, so this is the stricter variant every on-the-wire / on-disk
reader (ref wire blobs, the applied-packs record) shares to keep a
hand-edited or foreign-cased line malformed rather than silently accepted.