[_gabe_]

That's a link to the benchmark framework that I used. The C# benchmark are in a separate gist that I didn't feel like digging up. This is the C# benchmarks[0]. All the interfaces and indirection is the result of me adapting this from a separate comment. But the benchmark is just testing `HashSet.TryGetValue`.

Edit: I just re-ran the benchmarks because I didn't have the results pasted in the snippet (which I've now done so I don't keep getting this wrong haha). The C# HashSet takes around 130 nanoseconds, not microseconds. So it's not orders of magnitude slower, but it is still more than a 2x slow down and up to a 100x slow down in the case of an integer key.

[0]: https://gist.github.com/ambrosiogabe/ba6bd0fa80588c2fd2ca26d...