Module hex 

Lowercase hex for digest bytes.

Exists because sha2 0.11 (via digest 0.11 and hybrid-array) returns a plain Array from finalize/digest, and that type no longer implements LowerHex the way GenericArray did in 0.10. Every format!("{:x}", ...) on a hash therefore stopped compiling.

One helper rather than an inline fold at each of the four call sites: these strings are content-addressing keys and graph fingerprints that get compared against values already written to disk, so all four must agree on the encoding exactly. A single function makes that agreement structural instead of a thing four separate lines have to keep getting right.

Deliberately not a new dependency. The whole job is two lines, and a digest is the only thing this codebase ever hex-encodes.

Functions

encode

Encode bytes as lowercase hex, two characters per byte.