when dns_rdataslab_fromrdataset() is run, in addition to allocating space for a slab header, it also partially initializes it, setting the type match rdataset->type and rdataset->covers, the trust to rdataset->trust, and the TTL to rdataset->ttl.
when dns_rdataslab_fromrdataset() is run, in addition to allocating space for a slab header, it also partially initializes it, setting the type match rdataset->type and rdataset->covers, the trust to rdataset->trust, and the TTL to rdataset->ttl.