However, there are some subs which expect their arguments to be array variables (because the variable's data will be altered). Examples include pop() and shift().

I think this is incorrect. Any list of arguments supplied to a subroutine are inserted into the array @_ and pop and shift handle that accordingly. There's no such thing as subs expecting array variables.

In reply to Re^3: Differ. array and List by Jasper
in thread Differ. array and List by Anonymous Monk

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