If &allow-other-keys was specified in the lambda list of a function, keyword_2 argument checking is suppressed in calls to that function.
If the :allow-other-keys
argument is true in a call to a function,
keyword_2 argument checking is suppressed
in that call.
The :allow-other-keys
argument is permissible in all situations involving
keyword_2 arguments, even when its associated value
is false.