Make null byte error a ValueError #6094
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Currently we treat paths with null bytes as a TypeError, which is semantically an odd choice, especially as we treat empty paths as ValueError. We do this because the error is generated by zpp and it's easier to always throw TypeError there.
This changes the zpp implementation to throw a TypeError only if the type is actually wrong and throw ValueError for null bytes. The error message is also split accordingly, to be more precise.
Test updates here are very much WIP.