add a nugget of wisdom

test/nugget-of-wisdom-rdata.txt

@@ -0,0 +1,39 @@
+One of our tests wasn't passing and we were debugging and
+debugging only to be left scratching our heads.
+
+It turns out that labels in RDATA are terminated by RLENGTH,
+not by null (as most labels are), but since generally CLASS
+begins with 0x0001, which looks like a null terminator... in
+almost every case, it tooks us forever to figure it out.
+
+
+			# HEADER
+0000000 25 4f 81 80 00 01 00 02 00 00 00 00
+
+
+																			    # NAME
+																						03 61 6f 6c
+0000010 03 63 6f 6d 00
+											 00 10 00 01 c0 0c
+																			 # TYPE TXT is 16 (0x0010)
+																				 00 10
+																			 # CLASS IN is 1 (0x0001)
+																							 00 01
+																			             # TTL
+																										 00
+0000020 00 07 86
+							 # RDLENGTH
+								 00 1f
+                     # DATA
+											 1e 73 70 66 32 2e 30 2f 70 72 61
+0000030 20 70 74 72 3a 6d 78 2e 61 6f 6c 2e 63 6f 6d 20
+0000040 3f 61 6c 6c
+                # NOT NULL TERMINATED!!
+
+                # NEXT RECORD
+
+										c0 0c
+													00 10 00 01 00 00 07 86 00 1b
+0000050 1a 76 3d 73 70 66 31 20 70 74 72 3a 6d 78 2e 61
+0000060 6f 6c 2e 63 6f 6d 20 3f 61 6c 6c
+000006b