Use tagged union for getaddrinfo()#16010
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Diff from mypy_primer, showing the effect of this PR on open source code: urllib3 (https://github.com/urllib3/urllib3)
+ test/contrib/test_socks.py:120: error: Incompatible return value type (got "list[tuple[Literal[AddressFamily.AF_INET], SocketKind, int, str, tuple[str, int]] | tuple[Literal[AddressFamily.AF_INET6], SocketKind, int, str, tuple[str, int, int, int] | tuple[int, bytes]]]", expected "list[tuple[AddressFamily, SocketKind, int, str, tuple[str, int] | tuple[str, int, int, int] | tuple[int, bytes]]]") [return-value]
+ test/contrib/test_socks.py:120: note: "list" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ test/contrib/test_socks.py:120: note: Consider using "Sequence" instead, which is covariant
trio (https://github.com/python-trio/trio)
+ src/trio/_socket.py:218: error: Incompatible return value type (got "list[tuple[Literal[AddressFamily.AF_INET], SocketKind, int, str, tuple[str, int]] | tuple[Literal[AddressFamily.AF_INET6], SocketKind, int, str, tuple[str, int, int, int] | tuple[int, bytes]]]", expected "list[tuple[AddressFamily, SocketKind, int, str, tuple[str, int] | tuple[str, int, int, int] | tuple[int, bytes]]]") [return-value]
+ src/trio/_socket.py:218: note: "list" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ src/trio/_socket.py:218: note: Consider using "Sequence" instead, which is covariant
+ src/trio/_socket.py:247: error: Argument 1 to "to_thread_run_sync" has incompatible type "Callable[[bytes | str | None, bytes | str | int | None, int, int, int, int], list[tuple[Literal[AddressFamily.AF_INET], SocketKind, int, str, tuple[str, int]] | tuple[Literal[AddressFamily.AF_INET6], SocketKind, int, str, tuple[str, int, int, int] | tuple[int, bytes]]]]"; expected "Callable[[bytes | None, bytes | str | int | None, int, int, int, int], list[tuple[AddressFamily, SocketKind, int, str, tuple[str, int] | tuple[str, int, int, int] | tuple[int, bytes]]]]" [arg-type]
+ src/trio/_tests/test_socket.py:128: error: Argument 1 to "MonkeypatchedGAI" has incompatible type "Callable[[bytes | str | None, bytes | str | int | None, int, int, int, int], list[tuple[Literal[AddressFamily.AF_INET], SocketKind, int, str, tuple[str, int]] | tuple[Literal[AddressFamily.AF_INET6], SocketKind, int, str, tuple[str, int, int, int] | tuple[int, bytes]]]]"; expected "Callable[[str | bytes | None, str | bytes | int | None, int, int, int, int], list[tuple[AddressFamily, SocketKind, int, str, tuple[str, int] | tuple[str, int, int, int] | tuple[int, bytes]]]]" [arg-type]
mongo-python-driver (https://github.com/mongodb/mongo-python-driver)
+ pymongo/synchronous/helpers.py:135: error: Incompatible return value type (got "list[tuple[Literal[AddressFamily.AF_INET], SocketKind, int, str, tuple[str, int]] | tuple[Literal[AddressFamily.AF_INET6], SocketKind, int, str, tuple[str, int, int, int] | tuple[int, bytes]]]", expected "list[tuple[AddressFamily, SocketKind, int, str, tuple[str, int] | tuple[str, int, int, int] | tuple[int, bytes]]]") [return-value]
+ pymongo/synchronous/helpers.py:135: note: "list" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ pymongo/synchronous/helpers.py:135: note: Consider using "Sequence" instead, which is covariant
+ pymongo/asynchronous/helpers.py:135: error: Incompatible return value type (got "list[tuple[Literal[AddressFamily.AF_INET], SocketKind, int, str, tuple[str, int]] | tuple[Literal[AddressFamily.AF_INET6], SocketKind, int, str, tuple[str, int, int, int] | tuple[int, bytes]]]", expected "list[tuple[AddressFamily, SocketKind, int, str, tuple[str, int] | tuple[str, int, int, int] | tuple[int, bytes]]]") [return-value]
+ pymongo/asynchronous/helpers.py:135: note: "list" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ pymongo/asynchronous/helpers.py:135: note: Consider using "Sequence" instead, which is covariant
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Fixes our regression: #15788 (comment)
Should also fix the pre-existing ignore too.