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

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. ---------- nosy: +mjpieters _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue13769> _______________________________________