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It is not possible to override 'true', 'false' values during encoding bool.
For example if I want to dump dict like:
 {"key": True}
and result must be not 
 {"key": true}
but let's say
 {"key": "TRUE"}
It is really hard to force json.dumps function to do it.
I understand that improving of json encoder performance causes this inflexible implementation.
Perfect solution for extending/overriding json module would be move nested functions
_iterencode_list
_iterencode_dict
_iterencode
into class JSONEncoder as static methods.
But it could make performance a bit worse.
So if we cannot afford it I would propose to move function _make_iterencode to JSONEncoder as a static method.
This change will not degrade performance.
But it will be possible to override this method in SPECIFIC user's Encoder.