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In json module there are dump/dumps methods which internally instantiate encoder class JSONEncoder (or some other user-defined encoder clas).
They look as follows:
json.dump(obj, fp, 
 skipkeys=False,
 ensure_ascii=True,
 check_circular=True, 
 allow_nan=True,
 cls=None,
 indent=None,
 separators=None,
 default=None, 
 **kw)
json.JSONEncoder(skipkeys=False, 
 ensure_ascii=True,
 check_circular=True,
 allow_nan=True,
 sort_keys=False,
 indent=None,
 separators=None,
 default=None)
Some of dump/dumps arguments are passed to encoder class:
- skipkeys
- ensure_ascii
- check_circular
- allow_nan
- indent
- separators
- default
And it looks that sort_keys is just missing in keyword args in dump/dumps method.
But it still can be passed implicitly using **kw arg.
I would propose to do:
- add explicitly sort_keys keyword arg to dump/dumps methods
- add passing it to encoder class
- and adjust documentation accordingly.