You've got my interest on this one.  How does it work?  Or should I ask,
what is the theory behind it?

> div257
>         movf numhi,w
>         subwf numlo,w

Question: what happens to this value in wreg (numlo-numhi) once numhi is
moved back into w?

>         movf numhi,w
>         skpc
>          addlw -1
>         return

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