To me, it is blatantly obvious that DWIMness dictates that \(@foo) ought to return the same as [@foo]

I've never liked \(@foo) and thought it should be no different from \@foo (a reference to the array @foo).

My reasoning (undoubtedly flawed) is along the lines that the square brackets ([]) return a reference to whatever is within those brackets ...

Flawed, yes. [] creates a new array, initialized from the list given, and returns a reference to it. This differs from "return[ing] a reference to whatever is within" in that it is a shallow copy, so \@foo is affected by later changes to @foo's elements, while [@foo] is not (unless those elements are references to other things which are changed.)

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