p4raw-id: //depot/perl@21448
"ascii". (I<param> and I<flags> arguments can be ignored in most
cases)
-If the layer's C<Pushed> function uses an extra argument, this
-function is a must if the layer is ever going to be duped, since
-C<Dup> will use C<Getarg> to retrieve the argument originally passed
-to C<Pushed>.
+C<Dup> uses C<Getarg> to retrieve the argument originally passed to
+C<Pushed>, so you must implement this function if your layer has an
+extra argument to C<Pushed> and will ever be C<Dup>ed.
=item Fileno