Would you prefer this:

sub method {
  my ($self, $i, $new) = @_;
  my $old = $self->{B}[$i];
  $self->{B}[$i] = $new if @_ > 2;
  return $old;
}
[download]

Or this:

sub method {
  my ($self, $i, $new) = @_;
  my $old = $self->{B}[$i];
  $self->{B}[$i] = $new if @_ >= 3;
  return $old;
}
[download]

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