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In bpo-43651, I found code pattern that it's difficult to use io.text_encoding():
 class OpenWrapper:
 def __new__(cls, *args, **kwargs):
 return open(*args, **kwargs)
`kwargs["encoding"] = text_encoding(kwargs.get("encoding)` doesn't work because `open(filename, "b", encoding="locale")` raises `ValueError: binary mode doesn't take an encoding argument`.
I think we should accept `encoding="locale"` even in binary mode. It makes easy to use `text_encoding()` and `encoding="locale"`.