Use `std::hash<std::type_index>`, `std::equal_to<std::type_index>` everywhere except when libc++ is in use#4319

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rwgk merged 29 commits intopybind:masterfrom

rwgk:internals_std_type_index_modernization

Apr 25, 2023

Commits on Nov 6, 2022

Try using `std::hash<std::type_index>`, `std::equal_to<std::type_index>` everywhere.
rwgk
committed

Commits on Nov 7, 2022

Revert "Try using `std::hash<std::type_index>`, `std::equal_to<std::type_index>` everywhere."
rwgk
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Use "our own name-based hash and equality functions" for `std::type_index` only under macOS, based on results shown under https://github.com/pybind/pybind11/pull/4316#issuecomment-1305097879
rwgk
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Patch in PR #4313: Minimal reproducer for clash when binding types defined in the unnamed namespace.
rwgk
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test_unnamed_namespace_b xfail for clang
rwgk
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`PYBIND11_INTERNALS_VERSION 5`
rwgk
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Add a note to docs/classes.rst
rwgk
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For compatibility with Google-internal testing, test_unnamed_namespace_a & test_unnamed_namespace_b need to work when imported in any order.
rwgk
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Trying "__GLIBCXX__ or Windows", based on observations from Google-internal testing.
rwgk
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Try _LIBCPP_VERSION
rwgk
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Account for libc++ behavior in tests and documentation.
rwgk
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