[issue13378] ET: add custom namespaces to serialization methods

[R. David Murray]

R. David Murray added the comment:

This patch no longer applies to the tip of default.  Whoever updates it should also address Eli's comment about expanding the register_namespace doc.  I'm adding the 'easy' tag because Florent already did the hard work, and at this point it is just a patch update and doc change.

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keywords: +easy
nosy: +r.david.murray
stage: commit review -> needs patch
versions: +Python 3.5 -Python 3.4

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