canonical_compare
return canonical_compare(r1->rrset, r1->rr_idx, r2->rr_idx);
if(canonical_compare(&fk, 0, 1) != 0)
return canonical_compare(r1->rrset, r1->rr_idx, r2->rr_idx);
if(canonical_compare(&fk, 0, 1) != 0)