I dreamed up this hallucination, and my concrete sub wants to argue with me about it.  The argument concerns the keyway where the apron slab notches into an undercut in the floor slab, at the doorways.  He wants to put in some little thing about half the size using one beveled 2×4, instead of my two-thickness 2x6s, one beveled.  Should I compromise?  Either way, I think we should dowel it with some #4s straight through the key, on 16″ centers.  We begin the pour at 9:00 am tomorrow.