this post was submitted on 27 Jul 2023
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I was incorrect; the first part of my answer was my initial guess, in which I thought a boolean was returned; this is not explicitly the case. I checked and found what you were saying in the second part of my answer.
You could use strict equality operators in a conditional to verify types before the main condition, or use Typescript if that's your thing. Types are cool and great and important for a lot of scenarios (used them both in Java and Python), but I rarely run into issues with the script-level stuff I make in JavaScript.