python_version environment marker uses wrong precision #2
Description
PEP 508 says that python_version is {major}.{minor} and that >= is a version-aware-comparison operator.
There are real-world examples like
python_version >= "3.5.2"
that should be interpreted as >= "3.6" but we currently do not. Maybe passing in some kind of precision to VersionIntervals.add_spec would help...
This might also help with supporting "in" for python_version