This manual removal was informed by reviews of these commits (newest to oldest):

* d930de0b
* 114c0f2a
* 1c10b097
* 9d4b4dff
* da058a29

This reverts commit 7064d43b.

Conflicts resolved in:
    include/pybind11/eigen.h
    tests/test_builtin_casters.cpp

This reverts commit 6d3a0fc3.

This reverts commit 8720cf94.

This reverts commit c1f14f05.

Conflicts resolved in:
    include/pybind11/detail/smart_holder_type_casters.h
    tests/test_return_value_policy_override.py

This reverts commit 99cf27a4.

Revert "Add handling of `return_value_policy::_clif_automatic` in type_caster_pyobject_ptr.h (backported from https://github.com/google/pywrapcc/pull/30021)"

This reverts commit bd69f7aa.

[smart_holder] Fix terrible merge accident: `PYBIND11_INTERNALS_SH_DEF` missing in `PYBIND11_INTERNALS_ID` and `PYBIND11_MODULE_LOCAL_ID` (#5159)

* Fix oversight: Add `-DCMAKE_CXX_FLAGS="-DPYBIND11_USE_SMART_HOLDER_AS_DEFAULT"` for new `manylinux` job (Manylinux on 🐍 3.13t • GIL).

* Fix terrible merge accident introduced with pybind/pybind11#5085: `PYBIND11_INTERNALS_SH_DEF` was accidentally removed from `PYBIND11_INTERNALS_ID` and `PYBIND11_MODULE_LOCAL_ID`.

* Add a pybing function to clear a list.

* Add required error handling.

* Add `/* py-non-const */` as suggested by @Skylion007

---------

Co-authored-by: Ralf W. Grosse-Kunstleve <rwgk@google.com>

* fix(cmake): do not use Python::Interpreter when cross-compiling

* chore: apply cmake-format to pybind11NewTools.cmake

* fix(cmake): do not look for Python Interpreter component when cross-compiling

* feat(cmake): guess Python extension suffix

* fix: add pybind11GuessPythonExtSuffix.cmake to packaging test

* Use PYBIND11_CROSSCOMPILING instead of CMAKE_CROSSCOMPILING

* refactor: require PYBIND11_USE_CROSSCOMPILING

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

---------

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>

updates:
- [github.com/astral-sh/ruff-pre-commit: v0.4.5 → v0.4.7](https://github.com/astral-sh/ruff-pre-commit/compare/v0.4.5...v0.4.7

)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* ci: try Python 3.13t

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* fix: support Python 3.13t

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* fix: patch PyPy

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* tests: one more int cast

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* tests: cleanup

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* refactor: use named constant in tests for immortal refcounts

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* docs: move comment about free threaded Python

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

---------

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Added check on iterator end position

* Always use assert without conditional check

* Addressing code review comments

* style: pre-commit fixes

* Remove assert and throw

* Changed style slightly

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

* ci: add Python 3.13

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* tests: run the gc for 3.13+

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Revert "tests: run the gc for 3.13+"

This reverts commit fe8a3ce3d133f69582e8244b737456ff57559e55.

* ci: drop macos ARM for now, need pin updates

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* fix: use Python 3.13 API if on 3.13

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

---------

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

updated-dependencies:
- dependency-name: requests
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore(deps): update pre-commit hooks

updates:
- [github.com/pre-commit/mirrors-clang-format: v18.1.2 → v18.1.4](https://github.com/pre-commit/mirrors-clang-format/compare/v18.1.2...v18.1.4)
- [github.com/astral-sh/ruff-pre-commit: v0.3.5 → v0.4.3](https://github.com/astral-sh/ruff-pre-commit/compare/v0.3.5...v0.4.3)
- [github.com/pre-commit/mirrors-mypy: v1.9.0 → v1.10.0](https://github.com/pre-commit/mirrors-mypy/compare/v1.9.0...v1.10.0)
- [github.com/pre-commit/pre-commit-hooks: v4.5.0 → v4.6.0](https://github.com/pre-commit/pre-commit-hooks/compare/v4.5.0...v4.6.0)
- [github.com/python-jsonschema/check-jsonschema: 0.28.1 → 0.28.2](https://github.com/python-jsonschema/check-jsonschema/compare/0.28.1...0.28.2

)

* style: pre-commit fixes

* Update .pre-commit-config.yaml

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>

* chore(deps): bump the actions group with 1 update

Bumps the actions group with 1 update: [actions/labeler](https://github.com/actions/labeler).


Updates `actions/labeler` from 4 to 5
- [Release notes](https://github.com/actions/labeler/releases)
- [Commits](https://github.com/actions/labeler/compare/v4...v5

)

---
updated-dependencies:
- dependency-name: actions/labeler
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <support@github.com>

* ci: fix labeler

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* ci: move eigen to 64-bit only

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

---------

Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>

Bumps [jinja2](https://github.com/pallets/jinja) from 3.1.3 to 3.1.4.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/main/CHANGES.rst)
- [Commits](https://github.com/pallets/jinja/compare/3.1.3...3.1.4

)

---
updated-dependencies:
- dependency-name: jinja2
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [idna](https://github.com/kjd/idna) from 3.6 to 3.7.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](https://github.com/kjd/idna/compare/v3.6...v3.7

)

---
updated-dependencies:
- dependency-name: idna
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

Committed via https://github.com/asottile/all-repos

This was actually released in 2024!

This was noticed only when manually reviewing the diffs with the Google review tools.

* chore(deps): update pre-commit hooks

updates:
- [github.com/pre-commit/mirrors-clang-format: v17.0.6 → v18.1.2](https://github.com/pre-commit/mirrors-clang-format/compare/v17.0.6...v18.1.2)
- [github.com/astral-sh/ruff-pre-commit: v0.2.0 → v0.3.5](https://github.com/astral-sh/ruff-pre-commit/compare/v0.2.0...v0.3.5)
- [github.com/pre-commit/mirrors-mypy: v1.8.0 → v1.9.0](https://github.com/pre-commit/mirrors-mypy/compare/v1.8.0...v1.9.0)
- [github.com/Lucas-C/pre-commit-hooks: v1.5.4 → v1.5.5](https://github.com/Lucas-C/pre-commit-hooks/compare/v1.5.4...v1.5.5)
- [github.com/sirosen/texthooks: 0.6.4 → 0.6.6](https://github.com/sirosen/texthooks/compare/0.6.4...0.6.6)
- [github.com/shellcheck-py/shellcheck-py: v0.9.0.6 → v0.10.0.1](https://github.com/shellcheck-py/shellcheck-py/compare/v0.9.0.6...v0.10.0.1)
- [github.com/PyCQA/pylint: v3.0.3 → v3.1.0](https://github.com/PyCQA/pylint/compare/v3.0.3...v3.1.0)
- [github.com/python-jsonschema/check-jsonschema: 0.28.0 → 0.28.1](https://github.com/python-jsonschema/check-jsonschema/compare/0.28.0...0.28.1

)

* style: pre-commit fixes

* fix(types): correction for better typing

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

---------

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>