I used the Switch module around 2006 in a program of a few thousands of lines that was supposed to be used in a production environment. It caused some surprising bugs. I don't even remember what they were exactly, but it really wasn't something that i would expect to come from using such a module. It didn't save me any typing and didn't add any elegance to the code, and i wasted some time (an hour maybe) trying to understand what causes the bugs until i just replaced it with if/else and didn't look back.
given/when is great if you can use it, though.
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