Use requires-python
semantics for --universal
#4701
Merged
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Summary
This doesn't actually change any behaviors, but it does make it a bit easier to solve #4669, because we don't have to support "version narrowing" for the non-
RequiresPython
variants in here. Right now, the semantics are kind of muddied, because thetarget
variant is sometimes interpreted as an exact version and sometimes as a lower bound.