Fix compatible version specifier incorrectly strip trailing '0'

[kasium]

When comparing two specifier with the compatible operator, tailing zeros are incorrectly stripped.

Closes #421

[uranusjr]

Not sure if we need a test case for the specific problem raised originally in pypa/pip#9613—make sure 1.19.5 is not contained in SpecifierSet("~=1.18.0") & Specifier("~=1.18").

[kasium]

Not sure if we need a test case for the specific problem raised originally in pypa/pip#9613—make sure 1.19.5 is not contained in SpecifierSet("~=1.18.0") & Specifier("~=1.18").

let's add one

[kasium]

Hi all, can this now be merged?

[brettcannon]

It is the holidays so I don't know who's available to do a thorough review (I just quickly glanced at the code). At worst we can look at merging it in the new year.

[kasium]

Thanks, sound fine to me

[brettcannon]

Code LGTM, but this isn't my area of expertise. I'll give @pradyunsg a week to review, otherwise I will just lean on the review from @uranusjr . Feel free to @ me on this PR, @kasium in a week to get this merged.

[pradyunsg]

Thanks @kasium for the PR, and thanks @brettcannon for the mention! :)