Commits on Feb 11, 2021

1. Add protocol type BaseVersion …

   This allows mypy to know about all available properties when APIs return
   any Version type.
   
   For example, the pip project defines functions that return a
   _BaseVersion instance. One example is:
   
   https://github.com/pypa/pip/blob/bbf8466088655d22cd46b286c8f0b8150754c1d9/src/pip/_internal/metadata/base.py#L24
   
   Downstream projects, such as pip-tools, use mypy to help verify correct
   API use. pip-tools then calls methods on the _BaseVersion instance which
   reports:
   
       "_BaseVersion" has no attribute "is_prerelease"
   
   By defining the protocol, pip and other libraries can use use its typing
   information and it will be more useful to more projects.

   

   jdufresne committed Feb 11, 2021
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