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Arguments and values to get.

This (admittedly minor) question came up while we were writing up some
of the CommonLoops metaclass protocols.

Why does Common-Lisp GET take a default-value argument instead of
returning a second value indicating whether the property actually

Originally we had wanted to make CommonLoops' internal slot-access
function return a second value saying whether or not the slot-existed
but we ended up changing it to be more like GET.