[issue13881] Stream encoder for zlib_codec doesn't use the incremental encoder

[Martin Panter]

Changes by Martin Panter <vadmium+py at gmail.com>:


----------
dependencies: +Fix codecs.iterencode/decode() by allowing data parameter to be omitted
stage:  -> patch review

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13881>
_______________________________________