Support for PEP 660 was introduced in pip nearly a year ago [0]. Most build backends have implemented it since as well [1][2][3]. [0] https://pip.pypa.io/en/st

Support for PEP 660 was introduced in pip nearly a year ago [0]. Most build backends have implemented it since as well [1][2][3]. [0] https://pip.pypa.io/en/stable/news/#v21-3-1 https://pip.pypa.io/en/stable/news/#v21-3-1 [1] setuptools: https://github.com/pypa/setuptools/blob/main/CHANGES.rst#v6400 https://github.com/pypa/setuptools/blob/main/CHANGES.rst#v64... [2] flit: https://flit.pypa.io/en/latest/history.html?highlight=660#version-3-4 https://flit.pypa.io/en/latest/history.html?highlight=660#ve... [3] poetry: https://github.com/python-poetry/poetry-core/releases/tag/1.0.8 https://github.com/python-poetry/poetry-core/releases/tag/1....