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sub as_string {
  my $self = shift;
  return $self->__head->as_string
    . ($self->{mycrlf} || "\n")  # XXX: replace with ->crlf
    . $self->body_raw;
}

sub as_string {
  my $self = shift;
  return $self->header_obj->as_string . $self->crlf . $self->body;
}