> On Dec 5, 2017, at 4:02 PM, Nathaniel Smith <n...@pobox.com> wrote:
> 
> I haven't followed this so sorry if this is an annoying comment, but having 
> read this description I still don't really understand what Provides-Extra is 
> doing. Don't packages already include extra information? What problem 
> motivated this?


I’m pretty sure this field is literally what wheel already does. 
https://packaging.python.org/specifications/core-metadata/#provides-extra-optional-multiple-use
 
<https://packaging.python.org/specifications/core-metadata/#provides-extra-optional-multiple-use>
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