ANSI Common Lisp 3 Evaluation and Compilation 3.4 Lambda Lists
3.4.8 Deftype Lambda Lists
A deftype lambda list is used by deftype.
A deftype lambda list has the same syntax as a macro lambda list,
and can therefore contain the lambda list keywords as a macro lambda list.
A deftype lambda list differs from a macro lambda list
only in that if no init-form is supplied for an optional parameter
or keyword parameter in the lambda-list, the default value
for that parameter is the symbol * (rather than nil).
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