Add `type_caster<PyObject>`#4601

Merged

rwgk merged 21 commits intopybind:masterfrom

rwgk:type_caster_PyObject_master

May 7, 2023

Commits on Apr 1, 2023

Add `type_caster<PyObject>` (tests are still incomplete).
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Fix oversight (`const PyObject *`).
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Ensure `type_caster<PyObject>` only works for `PyObject *`
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Move `is_same_ignoring_cvref` into `detail` namespace.
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Add test_cast_nullptr
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Change is_same_ignoring_cvref from variable template to using.
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Remove `return_value_policy::reference_internal` `keep_alive` feature (because of doubts about it actually being useful).
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Add missing test, fix bug (missing `throw error_already_set();`), various cosmetic changes.
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Move `type_caster<PyObject>` from test to new include (pybind11/type_caster_pyobject_ptr.h)
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Add new header file to CMakeLists.txt and tests/extra_python_package/test_files.py
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Commits on Apr 3, 2023

Backport changes from https://github.com/google/pywrapcc/pull/30021 to https://github.com/pybind/pybind11/pull/4601
rwgk
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Commits on Apr 4, 2023

Commits on Apr 5, 2023

Commits on May 1, 2023

Merge branch 'master' into type_caster_PyObject_master
rwgk
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Commits on May 2, 2023

Add `T cast(object &&obj)` overload as suggested by @Skylion007
rwgk
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