[issue16333] Trailing whitespace in json dump when using indent

[Ezio Melotti]

Ezio Melotti added the comment:

It does, and the C accelerator doesn't seem to be used for this.
The patch looks good to me, however:
1) it now strips spaces even when explicitly specified in the separator (this might be ok though -- I don't see why someone would need them);
2) I'm not sure if this can be considered a bug fix and applied to all branches or if it should go on 3.4 only;

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<http://bugs.python.org/issue16333>
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