Fix #79 - avoid UB when writing lots of ZST's #80
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Fixes #79
Technically the issue also affects
{Hash, BTree}{Map, Set}but having more than0x7FFFFFFF_FFFFFFFFZST's with different hash values or different comparisons seems difficult to do by accident.I would add a test but this is impractical to test in debug mode and/or Miri, because it's too slow. Testing in release mode would work, but that wouldn't catch the original UB.