Replace mutex-guarded map with sync.Map #63
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sync.Map is quite fast, in particular for reads (5-10x). It's a bit slower for writes, but not much. On a Mac, a combination of 2 Gets and a Set will get a speedup of 2.5x with this PR.
I was planning to remove the whole package but as sync.Map isn't really type safe, I think we should keep it around so we have a type-safe map. The wrapper shouldn't impact performance, I think.
This PR should be ready to merge if you want it.