[issue30936] json module ref leaks detected by test_json

[STINNER Victor]

STINNER Victor added the comment:

Thanks for the fixes. I checked manually 2.7, 3.5, 3.6 and master branches with "./python -m test -R 3:3 test_json": no more leak!

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30936>
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