Sometimes I want this
```
$ echo -e '"\xe4\xbd\xa0\xe5\xa5\xbd"' | ./python -m json.tool --no-escape                         
"你好"
```

not just 
```
$ echo -e '"\xe4\xbd\xa0\xe5\xa5\xbd"' | ./python -m json.tool
"\u4f60\u597d" 
```

This is a duplicate of issue 27413.