[issue16333] Trailing whitespace in json dump when using indent

[Éric Araujo]

Éric Araujo added the comment:

I think the patch adds tests to a mixin class used to test the Python and the C code, so if it passes then no fix is needed in C.

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nosy: +eric.araujo

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