3.8

• add Containers_bencode for lightweight (de)ser

• perf(CCHash): improve a bit commutative hashing of arrays/lists

• perf(CCHash): only hash prefix of string/bytes

• feat(CCList): Add Assoc.{keys,values,map_values}

• feat(CCArray): add CCArray.map_inplace

• add CCString.{to_hex,of_hex}

• fix(Atomic): prevent race conditions under flambda, for now