“Where do Vanished objects go?” “Into non-being, that is to say, everything”

Yeah, so what the flying fish does this mean?

Is it some quantum theory thing about how it dissolves into atoms that will eventually make up everything else, or does it mean the object goes into a junk pile in the Room of Requirement or what?

I’m not a Ravenclaw, I would not answer this question correctly if the bronze knocker asked me. I’d be stumped by a million different possibilities.