When `#!key' does not appear in the <extended formals> and there is no <rest
formal>, an error is signaled regardless of presence of `#!optional' if there
are any remaining actual arguments.  But When `#!key' appears in the <extended
formals> regardless of presence of <rest formal>, an error is not signaled in
spite of superfluous actual arguments.  What is its rationale?

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Joo ChurlSoo