I suppose that in some sense, it depends on whether you're thinking along
the lines of the old SPDT RS-flipflop debouncer (which latches on on the
first "bounce", and assumes that the bounces "break" but don't go all the
way to the other contact) or a more common SPST RC/schmidt-trigger
debouncer, which requires the contact remain closed for longer than a
typical bounce time.  I think I was thinking along the former lines, and
everyone else is thinking along the latter (which is probably more correct,
given SPST switches.)

BillW

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