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fluid.copy() uses jQuery's .extend() method to make a deep copy of any object.
Java developers may recognize a similarity to the concept of POJOs (Plain Old JavaScript Objects). Other languages and frameworks have a similar concept; the key here is that Infusion doesn't impose a complex inheritance hierarchy or interface for your model. Java developers may recognize a similarity to the concept of POJOs (Plain Old Java Objects).
More details are at Framework Concepts#Model Objects.