Specializing.
(values{!value-typespec})
[Reviewer Note by Barmar: Missing &key]
value-typespec ::={typespec}{* [{&optional} {{typespec}{*}}] [{&rest} typespec] [&allow-other-keys]}
typespec---a type specifier.
This type specifier can be used only as the value-type in a function type specifier or a the special form. It is used to specify individual types when multiple values are involved. The &optional and &rest markers can appear in the value-type list; they indicate the parameter list of a function that, when given to multiple-value-call along with the values, would correctly receive those values.
The symbol * may not be among the value-types.
The symbol values is not valid as a type specifier; and, specifically, it is not an abbreviation for (values).
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