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> I never know what exactly evaluates to true vs false in PHP or JavaScript for example.

You don't have to know if you don't use implicit type-casting. Make it explicit and you won't really have to worry about it.

"Explicit is better than implicit" is part of the Zen of Python for a very good reason.

"You don't have to know if you don't use implicit type-casting. Make it explicit and you won't really have to worry about it. "

Correct. Unfortunately a lot of people use implicit casting a lot and have no idea that that's what they are doing.