Test again and again for a long time, is horizontal tabs (\ u0009) led to a json format conversion failure, namely forward in the background \ u0009 are included in the transmission of data, namely the \ t, namely the Tab key, but in the input box of manual can't input level tabs, can use notepad to enter a string, in the middle of the string "Tab" key to press the keyboard, and then tested by copying and pasting.

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