I want to overload an operator (ideally '~~') but want the result to be a list. It seems like that's not possible, the list is only handled like in scalar context.

Indeed. There were some messages on p5p about this quite recently. I think the outcome was "No, that's not possible. The implementor (Ilya) of overloading deemed it not necessary to be able to ask the context - that is, the operands are always in scalar context".

Note that when overloading was implemented, '~~' wasn't an operator, and only a few overloadable operators would behave differently in list context anyway. (<> being the obvious on. x behaves different in list context as well, but only if its LHS has parens, making it an odd one).

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