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now the extra state tables per interface can be killed
colliding state entries (same key data) just hang off the same state key
interface bound states are always inserted at the queue head
floating ones are always inserted at the queue tail
voila, ifbound ones always before floating
just have to check for state->ifp == ifp || !state->ifp

gives a fair performance boost, but I didn't really measure
we know it is faster anyway, and more interesting shit was waiting