[issue12911] Expose a private accumulator C API

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Here is a patch against 3.2.
In the default branch it will also help factor out some code from the _json module.

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stage:  -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12911>
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