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Loosen some types to avoid pain in real-life situations (#4870)

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In this diff:
* Loosen `set.__[i]sub__()` to allow typical use cases (that work at runtime). Namely, allow removing `unicode` from a set of `str`, and allow removing optional values from non-optional sets.
* Avoid using union return types in `cryptography` deserialization functions.
* Tune `SupportsItems` so that `dict` implements it on Python 2.

Co-authored-by: Ivan Levkivskyi <ilevkivskyi@dropbox.com>
This commit is contained in:
Ivan Levkivskyi
2020-12-29 18:31:14 +00:00
committed by GitHub
parent 1ae3158174
commit fb753c4226
5 changed files with 29 additions and 13 deletions
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4
stdlib/3/builtins.pyi
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@@ -807,8 +807,8 @@ class set(MutableSet[_T], Generic[_T]):
def __iand__(self, s: AbstractSet[object]) -> Set[_T]: ...
def __or__(self, s: AbstractSet[_S]) -> Set[Union[_T, _S]]: ...
def __ior__(self, s: AbstractSet[_S]) -> Set[Union[_T, _S]]: ...
def __sub__(self, s: AbstractSet[_T]) -> Set[_T]: ...
def __isub__(self, s: AbstractSet[_T]) -> Set[_T]: ...
def __sub__(self, s: AbstractSet[Optional[_T]]) -> Set[_T]: ...
def __isub__(self, s: AbstractSet[Optional[_T]]) -> Set[_T]: ...
def __xor__(self, s: AbstractSet[_S]) -> Set[Union[_T, _S]]: ...
def __ixor__(self, s: AbstractSet[_S]) -> Set[Union[_T, _S]]: ...
def __le__(self, s: AbstractSet[object]) -> bool: ...