Unrecognized Keyword Arguments (ANSI and GNU Common Lisp Document)

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#### 3.5.1.5 Unrecognized Keyword Arguments

It is not permitted to supply a keyword argument to a function using a name that is not recognized by that function unless keyword argument checking is suppressed as described in Suppressing Keyword Argument Checking.

If this situation occurs in a safe call,

an error of type program-error must be signaled; and in an unsafe call the situation has undefined consequences.