[issue14850] The inconsistency of codecs.charmap_decode

[Serhiy Storchaka]

Serhiy Storchaka <storchaka at gmail.com> added the comment:

> What is the question? U+FFFE also represents an undefined mapping in 
> string subclasses.

What about classes that not subclassed string but ducktyped string by
implementing all string method? What about list/tuple/array.array of
integers or 1-character strings? What about general mapping? Should any
of them have 0xFFFE or '\uFFFE' represent an undefined mapping?

> This is a single issue, a single bug. If the bug is fixed, it is fixed. 
> No need to go further (unless there is another bug somewhere).

My question, where is the limit of this bug.

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