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An interface is like a class, but it only contains the method's signatures. Interfaces can provide a layer of abstraction to code, and is an element of object-oriented programming.

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How Custom Iterators with Iterable Work

simplified to what the handler likely actually has to do, but this should demonstrate how it can take an iterator and use it to execute scopes Both List and queryLocator already implement the iterable() interface
IllusiveBrian's user avatar