fix: correctly check the arg count in precompiler.py

[oprypin]

This is supposed to check that all argument counts are equal, but due to an incorrect inversion of the conditional, it was checking that any pair of argument counts is equal

[rickeylev]

Thanks! I forgot that comparison chaining implicitly uses and between the pieces, but a negative comparison doesn't "expand" (I forget the logic term, commute? transitive?) like that, it needs to use or to be logically equivalent.