https://discuss.python.org/t/pep-658-714-are-now-live-on-pypi/26693/11

PEP 658/714 support has been merged in pip, and will be available in the next release (due in July).

Those are the JSON PyPI (plus bigfix) and serve-METADATA-files PEPs That means resolving packages on modern cheeseshops is speedy. Woof!