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9b97edb012
- Add an `Metadata.isFree` helper method. - Implement `Metadata.isTombstone` and `Metadata.isFree` with `@bitCast` then comparing to a constant. I assume `@bitCast`-then-compare is faster than the old method because it only involves one comparison, and doesn't require bitmasking. - Summary of benchmarked changes (`gotta-go-fast`, run locally, compared to master): - 3/4 of the hash map benchmarks used ~10% fewer cycles - The last one (project Euler) shows 4% fewer cycles.