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A state that encapsulates a set of {#requirements} with an {Array} of possibilities
A state that encapsulates a single possibility to fulfill the given {#requirement}
Provides information about specifcations and dependencies to the resolver, allowing the {Resolver} class to remain generic while still providing power and flexibility.
This module contains the methods that users of Gem::Resolver::Molinillo must to implement, using knowledge of their own model classes.