fix: Add logic to serialize objects of Send class

[gcalabria]

Closes #721

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[dsculptor]

Use of super without a class context is a bug here. Can we give the default serializer more powers to allow any object to be become json serializable?

Suggested change

	return super().default(obj)
	try:
	return obj.__dict__()
	except:
	pass
	raise TypeError(f"Object of type {obj.__class__.__name__} is not JSON serializable")