llRezObject will rez an object with the center of the to-be-rezzed object's
bounding box at the position specified.
llRezAtRoot will rez the object with it's root prim's center at the position
specified.
You won't see a difference unless the object to be rezzed has a center of
bounding box that is different from the center of it's root prim, i.e., rezzing
a linked object.
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