Hopefully this will be a more useful spec.
This begs for parenthesis in environment markers, something that is
easy to do by compiling markers to Python functions using the ast as
`markerlib` does.
Provides-Extra (multiple use)
:::::::::::::::::::::::::::::
A string containing the name of an optional feature. Must be a valid Python
identifier. May be used to make a dependency conditional on whether the
optional feature has been requested.
Example::
Provides-Extra: pdf
Requires-Dist: reportlab; extra == 'pdf'
...
Full changeset at
https://bitbucket.org/dholth/python-peps/changeset/4dc72bbf9ed2
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