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In Self 4.0, people write programs by directly constructing webs of objects in a larger world of objects. But in order to save or share these programs, the objects must be moved to other worlds. However, a concrete, directly constructed program is incomplete, in particular missing five items of information: which module to use, whether to transport an actual value or a counterfactual initial value, whether to create a new object in the new world or to refer to an existing one, whether an objectdoi:10.1145/217839.217845 fatcat:vtdko5veljcm7kcdz7dssxzvba