Hitting the top of the fence in fair territory and bounding over the wall would make it a home run. Hitting the foul pole (with a normally located foul pole) might confirm it was a fair ball when it hit the top of the fence. There is a possibility that it was a foul ball depending on where it hit the top of the fence and the configuration of the field. PBUC/MLBUM does allow a ground rule to supersede their "top of the wall" interp. I can't picture how that would happen.
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