code: public RRset
  findExactMatch(Name name, int type) {
  	Object types = exactName(name);
  	if (types == null)
  		return null;
  	return oneRRset(types, type);
  }
docs: Looks up Records in the zone, finding exact matches only.
  @param name The name to look up
  @param type The type to look up
  @return The matching RRset
  @see RRset