A (late-)demand analysis and w/w question

Hi, I was recently looking at #6087. One of the cases that increased allocations (see comment:27) is when we do worker/wrapper to pass an `Int#` instead of `Int` when we need the boxed form in the function body. This causes redundant allocations because we already have the boxed version of the value but we passed it unboxed as a result of worker/wrapper. This raises the obvious (but maybe naive?) question of whether we could improve the demand analysis and/or worker/wrapper to avoid unpacking arguments when the argument is boxed again somewhere in the function body. Does this make sense? Has anyone tried this before? Thanks, Ömer