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* feat: lazy compile

* refactor: lazy -> only_changed

* refactor: leave the changed function up to the user

* refactor: pass a function, based on @YannickJadoul and @HDembinski's suggestions

* refactor: old -> _old, as it's not intended for users

* docs: slight improvmenent from @rwgk

* docs: Ccache spelling, extra warning about pip caching

Ccache spelling noted by @YannickJadoul

Replaced adviced with advised.

* demo kwarg with none(false)

* Reorder and extend tests for arg::none(false) in test_methods_and_attributes.py::test_accepts_none

* Fix arg::none() for keyword arguments

* Add changelog note

* Fix names of no_none_kw test functions
Co-authored-by: Yannick Jadoul <yannick.jadoul@belgacom.net>

* fix: chapters in PDF again

* fix: sections in README

* docs: fix PDF build by adding unicode mappings

* fix: better PDF

* fix: html build issue

* style: use Black everywhere

* style: minor touchup from review

* feat: basic typing support

* docs: mention syncing as suggested by @rwgk

* docs: update changelog

* docs: copy of warning in limitations

* fix: ipo should be off for debug or relwithdebinfo

Closes #2587

* docs: slightly more detailed about IPO

* Update pybind11Common.cmake

* docs: some final 2.6.0 updates

* docs: better warning text

* fix: Intel 18+ fully supported

* fix: Intel compiler workaround no longer needed

Followup on #94 now that Intel 18+ is required.

* docs: FAQ CMake updates

* docs: limitations

* ci: don't over label

* docs: update CHANGELOG, add a bit more structure

* ci: label PRs with more labels, and sooner

* docs: updates from @rwgk

* docs: address @YannickJadoul's points

* Deprecated public constructors of module

* Turn documentation comment of module_::add_object into valid doxygen documentation

* Move definition of PYBIND11_DETAIL_MODULE_STATIC_DEF and PYBIND11_DETAIL_MODULE_CREATE macros up

* Move detail::create_top_level_module to module_::create_extension_module, and unify Python 2 and 3 signature again

* Throw error_already_set if module creation fails in module_::create_extension_module

* Mention module_::create_extension_module in deprecation warning message of module_::module_

* ci: skip cpptest on Win Py 3.8+

* docs: minor typo caught by @rwgk

* docs: minor cleanup

* ci: fix add-path command

* docs: add example of use in-place

* Update .github/workflows/ci.yml

* fix: PYBIND11_OBJECT could only be used inside the pybind11 namespace (regression)

* docs: add changelog for conversion protection change

* ci: update to Python 3.9

* feat: add a priority overload with py::prepend

* doc: fix wording as suggested by rwgk

* feat: add get_pointer

* refactor: is_prepended -> prepend (internal)

* docs: suggestion from @wjakob

* tests: add test covering get_pointer/set_pointer

* fix: find_import didn't work properly for classic tools

* ci: fix all files not being checked in style run

* Remove code inside 'PYPY_VERSION_NUM < 0x06000000' preprocessor if branch

* fix: more cleanup

* Remove more references to PyPy 5.7 and 5.9 in the docs

* Update comment on PyUnicode_UTF* in PyPy
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>

* WIP: module -> module_ without typedef

* refactor: allow py::module to work again

* feat: import check as a common function

* docs: add cmake to docs

* Allow function/functor passed to py::vectorize to return void

* Stealing @sizmailov's test and fixing unused argument warning

* Add missing std::move()

RVO doesn't work here because function return type is different from
actual returned type

* remove extra EOL

* docs: add a few details

* chore: pre-commit autoupdate

* Remove array_iterator, array_begin, and array_end (in detail namespace)
Co-authored-by: Sergei Izmailov <sergei.a.izmailov@gmail.com>
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>

Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>

* ci: releases

* docs: minor update form @wjakob

* fix: enforce reasonable version of setuptools

* docs: read version from pybind11 file

* docs: show full PEP 440 version everywhere

* docs: installing section

* docs: feedback from @wjakob

Support C++20. For backwards compatibility, we provide an alias for the old name.
This change is necessary to easily avoid errors when a compiler thinks
`module` is used as a keyword.

* refactor: drop mkdoc

* docs: update changelog

* feat: setup.py redesign and helpers

* refactor: simpler design with two outputs

* refactor: helper file update and Windows support

* fix: review points from @YannickJadoul

* refactor: fixes to naming and more docs

* feat: more customization points

* feat: add entry point pybind11-config

* refactor: Try Extension-focused method

* refactor: rename alt/inplace to global

* fix: allow usage with git modules, better docs

* feat: global as an extra (@YannickJadoul's suggestion)

* feat: single version location

* fix: remove the requirement that setuptools must be imported first

* fix: some review points from @wjacob

* fix: use .in, add procedure to docs

* refactor: avoid monkeypatch copy

* docs: minor typos corrected

* fix: minor points from @YannickJadoul

* fix: typo on Windows C++ mode

* fix: MSVC 15 update 3+ have c++14 flag

See <https://docs.microsoft.com/en-us/cpp/build/reference/std-specify-language-standard-version?view=vs-2019>

* docs: discuss making SDists by hand

* ci: use pep517.build instead of manual setup.py

* refactor: more comments from @YannickJadoul

* docs: updates from @ktbarrett

* fix: change to newly recommended tool instead of pep517.build

This was intended as a proof of concept; build seems to be the correct replacement.

See https://github.com/pypa/pep517/pull/83

* docs: updates from @wjakob

* refactor: dual version locations

* docs: typo spotted by @wjakob

* refactor: replace .get_type with type::handle_of

* refactor: use impl for handle_of

* fix: deprecate h.get_type()