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It was suggested that there be a general facility in CLOS to reinitialize an
instance. It would then be used for updating classes and generic functions.
The following is a strawman proposal for the standard method for
((instance standard-object) &rest reinit-args &key &allow-other-keys)
(default-initargs (class-of instance) reinit-args)))
This uses the code for initialize-instance to do whatever it would ordinarily
do, using the standard defaulting method for the arguments. It also allows
users to write :before and :after methods on reinitialize-instance to take
special actions for reinitialization.
1) There is no argument legality checking.
2) reinitialize-instance does not see the defaulted list of initargs