For a while now, Python has allowed return types to be specified in
signatures:
def f() -> int:
It is my understanding that this doesn't actually do any error-checking or
type-checking — see https://docs.python.org/3/library/typing.html. So this
works without error:
def f() -> float:
return "hello"
This is cropping up in the Sage library. The file combinat/permutation.py
has several methods that claim (according to their signature) to return an
`Integer` but actually return an `int`, and this has led to at least one
person being confused (a recent post on stackexchange cited in the github
issue). Anyway, I've opened https://github.com/sagemath/sage/issues/36198
for one of these instances, and we should be aware of this.
--
John
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