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3.4.1.4.1.1 Examples of Suppressing Keyword Argument Checking
;;; The caller can supply :ALLOW-OTHER-KEYS T to suppress checking.
((lambda (&key x) x) :x 1 :y 2 :allow-other-keys t) => 1
;;; The callee can use &ALLOW-OTHER-KEYS to suppress checking.
((lambda (&key x &allow-other-keys) x) :x 1 :y 2) => 1
;;; :ALLOW-OTHER-KEYS NIL is always permitted.
((lambda (&key) t) :allow-other-keys nil) => T
;;; As with other keyword arguments, only the left-most pair
;;; named :ALLOW-OTHER-KEYS has any effect.
((lambda (&key x) x)
:x 1 :y 2 :allow-other-keys t :allow-other-keys nil)
=> 1
;;; Only the left-most pair named :ALLOW-OTHER-KEYS has any effect,
;;; so in safe code this signals a PROGRAM-ERROR (and might enter the
;;; debugger). In unsafe code, the consequences are undefined.
((lambda (&key x) x) ;This call is not valid
:x 1 :y 2 :allow-other-keys nil :allow-other-keys t)
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