feat: add serde feature & PartialOrd & Ord

[dignifiedquire]

No description provided.

[rklaehn]

Somebody has added serde support to the original blake3 crate. Maybe we should try to get in sync with "upstream" before doing this ourselves...

BLAKE3-team/BLAKE3@5e3eb94

[dignifiedquire]

Somebody has added serde support to the original blake3 crate. Maybe we should try to get in sync with "upstream" before doing this ourselves...

BLAKE3-team/BLAKE3@5e3eb94

This is worse than what we have, because we do the human readable differentation though

[matheus23]

A little bit of an "oof" for reviewing the const-time Ord implementation from me.

Would you be up for writing a small proptest that checks the const-time Ord for Hash against the non-const-time Ord for [u8; 32]?

Something like this:

#[proptest]
fn prop_hash_ord_matches_slice_ord(a: [u8; 32], b: [u8; 32]) {
    prop_assert_eq!(
        Hash::from_bytes(a).cmp(&Hash::from_bytes(b)),
        a.cmp(&b)
    );
}

Needs test-strategy for the nice #[proptest] annotation.