[issue4783] document that json.load/dump can’t be used twice on the same stream

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

Attached patch adds a note about the effects of using dump several times on the same file.

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keywords: +easy, needs review, patch
nosy: +ezio.melotti
stage:  -> patch review
Added file: http://bugs.python.org/file21645/issue4783.diff

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