In the particular case of returning multiple indexes into a string though, you don't usually know in advance how many matches there will be, so destructuring isn't an option.
Multiple return values from a form are allocated on the stack, not on the heap. I don't 100% understand what that means, though...
One practical consequence is that you don't have to deal with later multiple values if you don't want to, but when values are returned as a list, you have to deal with them.
