if( 0 == @_ ) {
        &$sub();
    } elsif( 1 == @_ ) {
        &$sub( $_[0][0] );
    } elsif( 2 == @_ ) {
        &$sub( $_[0][0], $_[1][0] );
    } elsif( 3 == @_ ) {
        &$sub( $_[0][0], $_[1][0], $_[2][0] );
    # etc to some arbitrary maximum number of arguments
    }