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[tlaplus] How does TLC functions work under the hood?

Hello all,

I have some TLA+ spec that makes heavy use of functions and TLC takes a long time (minutes) to check that even the simplest property, i.e., `[](FALSE)`, doesn't hold. This made me question how TLC handles functions, but I can't find information elsewhere.

When I write [ x \in TypeX |-> f(x) ], is TLC generating all elements in `TypeX` then computing their image under `f` or does it wait until its called with an argument `m` to compute its image under `f`?

Is there a way to make TLA+ lazy, preventing it from ever generating `TypeX` in its entirety? Unfortunately we have some very large `TypeX`s in our generated code, such as the type of functions that receive lists and return lists.

Unfortunately, I can't use operators here because these need to be passed as arguments to mutually recursive operators.


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