anatoly techtonik writes:
PEPs are made to resolve ambiguities. But it doesn't mean limiting flexibility and setting hard limitation. What is hard limitation standard? For example, marking version you can not parse as pre-release. PIP actually does this, which prevents all packages with versions that are not comply with "versioning PEP" from installing.
You say you've filed a bug. That's the right thing to do. AFAICT, to the extent that it really *prevents* installation, it doesn't conform to PEP 440 (see "Handling of Pre-Releases" and "Direct References" in the PEP). Since it is arguably a bug, it doesn't need discussion here.