Behaviour for choosing the best packed box during selection (analog of BoxPacker's PackedBoxSorter).
Summary
Callbacks
Return a negative int if a sorts before b, positive if after, 0 if equal.
Callbacks
@callback compare( a :: ExBoxPacker.Result.PackedBox.t(), b :: ExBoxPacker.Result.PackedBox.t() ) :: integer()
Return a negative int if a sorts before b, positive if after, 0 if equal.