Padded Calver is breaking comparisons

[shughes-uk]

Fairly easy to recreate

from packaging import specifiers
# this returns False
specifiers.SpecifierSet("~=2022.01.01").contains("2022.01.01")

Seems when passing the raw string the parse function is reducing the comparison version to 2022.1.1 which never matches ~=2022.01.01.

My workaround is to always parse the version and use version.base_version for the specifier

from packaging import specifiers, version

spec_version = version.parse("2022.01.01")
specifiers.SpecifierSet(f"~={spec_version.base_version}").contains("2022.01.01")

[pradyunsg]

Can you reproduce this with the current main branch of this repository?

pip install git+https://github.com/pypa/packaging

[shughes-uk]

Yup

In [3]: from packaging import specifiers
   ...: 
   ...: # this returns False
   ...: specifiers.SpecifierSet("~=2022.01.01").contains("2022.01.01")
   ...: 
Out[3]: False

In [4]: import packaging

In [5]: packaging.__version__
Out[5]: '21.4.dev0'

Python 3.8.13 on arm64 macos

[uranusjr]

I believe this is the same as #561; ~= {version} simply delegates everything to == {version}.*.