Originally PEP 426 changed the syntax to be ``foo (==2.0)`` and such, and in that regards it made sense
to indicate a default operation for ``foo (2.0)``. However we removed them because:
* That syntax is backwards incompatible with the syntax that setuptools uses, and it’s sort of a pain to
enter on the CLI.
* A default isn’t that useful, no matter what we pick it’s going to be wrong, originally PEP 386 had it
equal to == (but a weird == that doesn’t make sense to me), then PEP 440 originally changed it to
~= but that doesn’t make sense for date based releases which would be better implemented as
>= or >.
PGP: 7C6B 7C5D 5E2B 6356 A926 F04F 6E3C BCE9 3372 DCFA