Nick Coghlan a9b15241c6 Close #20404: blacklist non-text encodings in io.TextIOWrapper ...

- io.TextIOWrapper (and hence the open() builtin) now use the
  internal codec marking system added for issue #19619
- also tweaked the C code to only look up the encoding once,
  rather than multiple times
- the existing output type checks remain in place to deal with
  unmarked third party codecs.

2014-02-04 22:11:18 +10:00

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