Arrays are toastable. (At least if you initdb, which I didn't force.)

Arrays are toastable.  (At least if you initdb, which I didn't force.)
Remove a bunch of crufty code for large-object-based arrays, which is
superseded by TOAST and likely hasn't worked in a long time anyway.
Clean up array code a little, and in particular eliminate its habit
of scribbling on the input array (ie, modifying the input tuple :-().