What you want is presumably a bitset with a statically determined size, eg. something like Bitset<64> or Bitset<u64>. I’m a bit flummoxed that such a thing does not actually seem to exist on crates.io, at least none with significant downloads. The fixedbitset crate despite the name is in fact backed by a Vec and not fixed. enumset is great if you have an enum, but not for generic unnamed bits. There’s smallbitset which does provide a Set64 among others, so you might want to check it out.
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