arbitrary equality and version normalization

[dimbleby]

per packaging discussion thread

currently it looks like versions are normalized on one side but not the other?

>>> from packaging.specifiers import *
>>> Specifier("===1.1").contains("1.01")
True
>>> Specifier("===1.01").contains("1.1")
False

probably similar applies to normalization of eg pre-releases etc?

Hard to reconcile with the description of "simple string equality operations which do not take into account any of the semantic information such as zero padding ..."

[notatallshaw]

Thanks for the report, may be the same root cause as #766, which is that the specifiers version ends up being prematurely normalized.

I plan to work on that issue as my next arbitrary equality issue after I land #954 and we decide on #974, I will take this as a test case.

If this is the same root cause we may need to weigh the cost of breaking backwards compatibility vs. complying with the spec.