Arguments and values to get.

[mips!escargot.earl@glacier (Earl Killian)]

When you really need to know whether the value was present in the
property list or not, I agree that the &OPTIONAL default argument to
GET is painful.  Other times, however, it is exactly what you want
(you really just want a default value), and implementing the default
from a second return value is painful.  Thus the current definition
is not a mistake, although it may not be featureful enough.