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The JSONEncoder documentation says we can implement our own encoder as:
 >>> class ComplexEncoder(json.JSONEncoder):
 ... def default(self, obj):
 ... if isinstance(obj, complex):
 ... return [obj.real, obj.imag]
 ... return json.JSONEncoder.default(self, obj)
Later on, we give the following example of how to implement the default method in a subclass of json.JSONEncoder:
 def default(self, o):
 try:
 iterable = iter(o)
 except TypeError:
 pass
 else:
 return list(iterable)
 return JSONEncoder.default(self, o)
These are both incorrect, as a quick reading of the source will reveal. JSONEncoder.default() throws for all input values. We should s/JSONEncoder.default/JSONEncoder.encode/ here, I think.