CLHS: Section 3.4.8

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## 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).

The following X3J13 cleanup issues, not part of the specification, apply to this section:

- DEFTYPE-KEY:ALLOW
- DEFTYPE-DESTRUCTURING:YES

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