Common Lisp the Language, 2nd Edition

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### 28.1.3.3. Inheritance of Class Options

The `:default-initargs` class option is inherited. The set of defaulted initialization arguments for a class is the union of the sets of initialization arguments specified in the `:default-initargs` class options of the class and its superclasses. When more than one default initial value form is supplied for a given initialization argument, the default initial value form that is used is the one supplied by the class that is most specific according to the class precedence list.

If a given `:default-initargs` class option specifies an initialization argument of the same name more than once, an error is signaled.