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Inconsisten handling of non-ASCII characters in encodings.normalize_encoding() #136736

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3.13bugs and security fixes3.14bugs and security fixes3.15new features, bugs and security fixesstdlibPython modules in the Lib dirtopic-unicodetype-bugAn unexpected behavior, bug, or error
@serhiy-storchaka

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@serhiy-storchaka

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#83518 changed handling of non-ASCII characters inencodings.normalize_encoding(), but it is still inconsistent withcodecs.lookup(), and not even self-consistent. For example:

>>>import encodings>>> encodings.normalize_encoding('a¤b')'a_b'>>> encodings.normalize_encoding('aæb')'ab'>>> encodings.normalize_encoding('a-¤')'a'>>> encodings.normalize_encoding('a-æ')'a_'>>> encodings.normalize_encoding('a-¤-b')'a_b'>>> encodings.normalize_encoding('a-æ-b')'a__b'

You can even get an underscore at the end or repeated underscores in the middle.

cc@malemburg,@vstinner,@shihai1991

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    3.13bugs and security fixes3.14bugs and security fixes3.15new features, bugs and security fixesstdlibPython modules in the Lib dirtopic-unicodetype-bugAn unexpected behavior, bug, or error

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