[issue23231] Fix codecs.iterencode/decode() by allowing data parameter to be omitted

[Martin Panter]

Martin Panter added the comment:

Here is my documentation proposal.

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components: +Documentation -Library (Lib)
stage:  -> patch review
versions: +Python 3.5
Added file: http://bugs.python.org/file44164/iter-unsupported.patch

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<http://bugs.python.org/issue23231>
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