Collision Filter - looking for no collision AND no collision event

I’m successfully using a collision filter to manage the physical interactions of my physics objects.  However, the objects that don’t collide due to the collision filter still generate collision events.  As I have hundreds of physics objects in my app, I’m looking for a way to turn off the collision events to match the collision filter (and conserve memory).  

i.e. - no collision = no collision AND no collision event.  It would be as if the object.isBodyActive = false          but only for other objects not in our object’s maskbits

I currently have objects grouped by “type” and use that as a filter.

if (event.other.type == “friend”) then

     – ignore

end

but ignoring the collision event all together would be preferable if that’s even a possibility.  I’m not even sure how much memory would be conserved but with so many physics objects in play I’m looking for reductions wherever I can find them.

Thanks,

Jonathan