Add `format_descriptor<>` & `npy_format_descriptor<>` `PyObject *` specializations.#4674

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rwgk merged 24 commits intopybind:masterfrom

rwgk:numpy_pyobject_ptr_master

May 23, 2023

Commits on May 18, 2023

Add test_format_descriptor_format
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Ensure the Eigen `type_caster`s do not segfault when loading arrays with dtype=object
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Use `static_assert()` `!std::is_pointer<>` to replace runtime guards.
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Add comments to explain how to check for ref-count bugs. (NO code changes.)
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Make the "Pointer types ... are not supported" message Eigen-specific, as suggested by @Lalaland. Move to new pybind11/eigen/common.h header.
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Change "format_descriptor_format" implementation as suggested by @Lalaland. Additional tests meant to ensure consistency between py::format_descriptor<>, np.array, np.format_parser turn out to be u…
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resolve clang-tidy warning
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Account for np.float128, np.complex256 not being available on Windows, in a future-proof way.
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Fully address i|q|l ambiguity (hopefully).
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Commits on May 19, 2023

Commits on May 20, 2023

Change `item_type_is_equivalent_to<>()` from `static` function to member function, as suggested by @Lalaland
rwgk
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