It's a little magicky. I guess the "Order=True" is what ensures the order of the parameters in the auto-generated constructor matches the order in which the instance variables are defined?
order: If true (the default is False), __lt__(), __le__(), __gt__(), and __ge__() methods will be generated. These compare the class as if it were a tuple of its fields, in order.
eq: If true (the default), an __eq__() method will be generated. This method compares the class as if it were a tuple of its fields, in order. Both instances in the comparison must be of the identical type.
