[issue14850] The inconsistency of codecs.charmap_decode

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

U+FFFE is documented as representing an undefined mapping, see

http://docs.python.org/dev/c-api/unicode.html?highlight=charmap#PyUnicode_DecodeCharmap

So the base string case is correct; the derived string implementation also needs to invoke the error handler.

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