Amending PEP 427 (and PEP 625) on package normalization rules

[dstufft (Donald Stufft)]

@CAM-Gerlach

I might be mistaken, but as I understand it most of the other backends, e.g. @ofek 's Hatch and @takluyver 's Flit, had already implemented what was eventually specified in the current wheel spec, and Setuptools was the main outlier? Perhaps they, @frostming and @sdispater could confirm their current situation?

Flit doesn’t seem to support names with . at all, but it does lowercase the produced wheel names.

Poetry produces wheels with a . in their name and caps:

Building Foo.bar (0.1.0)
  - Building sdist
  - Built Foo.bar-0.1.0.tar.gz
  - Building wheel
  - Built Foo.bar-0.1.0-py3-none-any.whl

Hatch normalizes fully:

[sdist]
dist/foo_bar-0.0.1.tar.gz

[wheel]
dist/foo_bar-0.0.1-py3-none-any.whl

Setuptools does not.

Hatch only can work to release to PyPI because it doesn’t actually let you have a . in your name either, it hard normalizes all names and removes the concept of display names completely.