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0fe377ce42
This change makes ndarray a bit easier for tooling to handle, since de-facto
all these methods are supposed to return *something*, but the type inferrable
from their default implementations is None.
As a hand-wavy aside, in a type stub
def f(): ...
could be treated equivalently to
def f() -> Any: ...
because there is no body to infer return type from, and Any is a reasonable
fallback type. In a .py file, however, f is no longer just a function *type*
(as opposed to function *implementation*), and thus it has an inferrable
return type.