[docs] [issue13769] json.dump(ensure_ascii=False) return str instead of unicode

[Martijn Pieters]

Martijn Pieters added the comment:

I'd say this is a bug in the library, not the documentation. The library varies the output type, making it impossible to use `json.dump()` with a `io.open()` object as the library will *mix data type* when writing. That is *terrible* behaviour.

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nosy: +mjpieters

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13769>
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