[tlaplus] Type checking and custom infinite sets

["'Chris Jensen' via tlaplus" <tlaplus@xxxxxxxxxxxxxxxx>]

Hi!
When you have a type invariant for a system like Paxos, you can check that 
for example ballot numbers are members of the set of natural numbers.

What I am trying to do (and can't seem to find any documentation on) is how 
to define my own infinite sets (for example one which is defined by some 
predicate).
This is specifically just for type checking, and thus should just be 
checking whether a value is an element of a set, hence should just be able 
to use the predicate.

Is there any way to do this?

--
Thanks,

Chris

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