STINNER Victor <vstin...@python.org> added the comment:
The proposed change will affect many builtin types: bytes, bytearray, str, but
also other types like collections.UserString. Would it make sense to summarize
what has been said in the python-ideas thread into a PEP? It may good to
specify things like:
>>> x = "A"*10**6
>>> x.cutprefix("B") is x
True
The specification can be just "that's an implementation detail" or "CPython
implementation specific" :-)
I don't expect such PEP to be long nor controversial, but it may help to write
it down.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39939>
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