You have a good point, but are you expecting your system to act like that? It's very rare you need to actually be checking for that, but if you do suspect it then definitely go for the finite checking.
But then again, I love using the "joi" package for my type checking.
Normally no, but in this case yes. It's a bare-bones project and the code is constructing a DB query from a set of known inputs, so null and undefined get treated as null, strings get quotes around them, and everything else is passed through.
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