[5.1][Foundation] Modernize hashing in Foundation's Swift-only types #24228
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…*all* components The new definition diverges from the existing hashValue: it feeds all path components to the hasher, rather than just a limited subset. Hashing all the bits that are compared in == is necessary to ensure proper operation of the hash table.
This replaces the compiler-generated variant (based on hashValue) with a better implementation.
Note: URL does not implement Hashable.
I’m not sure why I was so convinced it wasn’t, but this certainly simplifies things.
…trary subset" This reverts commit b711ed9.
…bilize hashing The `ObjectIdentifier(object as AnyObject)` is not necessarily stable; this breaks reflexivity for ==, and it makes the hash encoding nondeterministic.
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This is cherry picked from #23832; see discussion there.
rdar://problem/43394032