There's a long time issue of trying to differentiate mappings and sequences in the C-API in a fast and reliable way.
Due to recent changes, we might be able to do so at last, by checking tp_flags + str/bytes/bytearray which are considered unique. This might be a breaking change in the Stable ABI promise but one that can be considered a bug fix as the current behavior is lacking. What do you think? bpo: https://bugs.python.org/issue46376 Best regards, Bar Harel
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