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:First, "a function that is stored as data (a reference)" is nonsense. Either you pass a function itself, or you pass a reference to the function; both are possible, but they are not the same thing.
:Second, what is this "original abstraction layer" doing there? Callbacks are simply a mechanism; they may or may not be used to create an abstraction layer of some kind, but no such layer needs to exist for a callback to be created.
:This is much like starting an article on ''Apple'' with the sentence: ''an apple is a fruit that is stored as organic matter (a word) and designed to be eaten by man -
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