Generate v5 & v3 UUIDs from Values that Implement `Hash`

[azdle]

Generate v5 & v3 UUIDs from Values that Implement `Hash`

[KodrAus]

Just coming back through some triage. It looks like as nice as this would be a to do, we probably can't in a non-breaking way, so I'll go ahead and close this one for now. We might be able to revisit it in the future if things change.

[KodrAus]

Hi @azdle 👋 This is a great suggestion 👍 I'd consider loosening that bound to be a minor change (the old API evolution RFC thinks so too). You're right that inference would break, like in this example:

let uuid = Uuid::new_v5(ns, name.as_ref());

but I think that's ok. These aren't really widely used methods and the proposed signature is better.

[KodrAus]

The ideal signature would probably simply be:

fn new_v5(namespace: &Uuid, name: impl Hash) -> Uuid

[KodrAus]

I looked into this, and it's unfortunately not as straight-forward as you'd hope. The standard hash APIs aren't really compatible with md5 or sha1, and when wrapped the hashing of slices produces different results than it previously did.

I think the best approach for now will be to add some examples to the project that show how you can convert something that implements Hash into a slice to pass to new_v5.