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My understanding is that in a programming language, built-ins are bindings that exist without the user having to make them. (Like + to its referent, for example.)

My understanding of a constant literal is that it is a variable whose name encodes its value. (Like 3, or {"Name": "Steve", "age": 47} in JS.

Is a constant literal considered a type of built-in?

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A literal is not a variable. See https://en.wikipedia.org/wiki/Literal_(computer_programming).

I wouldn't consider a literal a "built-in", but I'm not familiar with a precise formal definition of "built-in".

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