Thanks. I think I might like an option to disable str(bytes) without disabling str != bytes. Unless the second operation would also corrupt output.

Came across this kind of set in the hyper http library which uses a set to accept certain headers with either str or bytes keys.

On Tue, Jun 18, 2019, 13:05 Christian Heimes <christian@python.org> wrote:

On 18/06/2019 18.32, Daniel Holth wrote:
> set([u"foo", b"foo]) will error because the two kinds of string have the
> same hash, and this causes a comparison. Is that correct?

Yes, it will fail with -bb, because it turns comparison between str and
bytes into an error. This can also happen with other strings when
hash(u'somestring') & mask == hash(b'otherbytes') & mask. The mask of a
set starts with PySet_MINSIZE - 1 == 8 and increases over team.

Christian

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