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 From Steele, p.165: "Note that there is no way to distinguish an absent
property from one whose value is <default>." The <default> argument is
optional and defaults in turn to nil, so get on an absent property is
normally identical in value to get on a property with explicit value nil.
Winston & Horn, p.97, shows (setf (get <sym> <prop>) nil) as equivalent
to remprop "as far as get is concerned...although it is better programming
practice to use remprop."
						Cheers, Pc^2