On Thu, Feb 27, 2014 at 12:16 AM, Vinay Sajip
but my question was what are you adding, if anything, that warranted it having "Metadata-Version: 2.0"?
I believe that the fields 'Private-Version', 'Obsoleted-By', 'Setup-Requires-Dist', 'Extension' and 'Provides-Extra' were added on top of the 1.2 metadata in an early version of PEP 426, before the move to JSON.
from a quick scan of the wheel code, I only see "Provides-Extra" as something additional to 1.2 Setuptools additionally acquired logic for "Provides-Extra" in "DistInfoDistribution" afaik, "Provides-Extra" is not literally in PEP426, so it has no PEP home? but it's implemented? it sounds like we need some version to capture this change?, or just consider it a mess, and leave at that.