`ZipFile.open()` return type

[AT0myks]

ZipFile.open() returns an instance of ZipExtFile if mode='r' and an instance of _ZipWriteFile if mode='w', but in typeshed its return type is IO[bytes].

typeshed/stdlib/zipfile/__init__.pyi

Lines 228 to 230 in 1cbfc75

	def open(
	self, name: str | ZipInfo, mode: _ReadWriteMode = "r", pwd: bytes | None = None, *, force_zip64: bool = False
	) -> IO[bytes]: ...

Is this on purpose? Would it be possible instead to have an overload for each case?

[srittau]

Generally nowadays IO return types are a bit frowned upon in typeshed (at least by me). I'm actually on a snail-like long-term mission to eliminate IO in typeshed where possible. So any improvements here are very welcome!