Right now we have find_equiv, but nothing else on the hash map implementation that we have. We have received a few PRs for adding more *_equiv methods, and we need to decide how these are going to work out.

I envision one of three routes to take:

1. Purge *_equiv and figure out a better way of not allocating when looking up in maps with keys of ~str
2. Remove everything except find_equiv
3. Make *_equiv variants of all functions.