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[tlaplus] Why vars is defined as tuples instead of set

Hi tlaplus group,

I am just curious with the convention why vars is defined as tuples of variables for UNCHANGED, <<A>>_vars, [A]_vars, [][Next]_vars, WF_vars and SF_vars. My understanding is that tuples preserved ordering of elements. Maybe I am still confused or still having a hang over with Programming Language, but I like to understand why tuple is the selected convention for such variables for those semantics, instead of set. Sometimes it confused me to make sure I follow the ordering from how I defined them in vars up to the way I removed variables in my UNCHANGED _expression_.


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