I found this document extremely helpful while writing cl-tls. Gutmann also points out a phenomenon he calls "bug conformance", where a major implementation of a

I found this document extremely helpful while writing cl-tls. Gutmann also points out a phenomenon he calls "bug conformance", where a major implementation of a spec (Microsoft's, in this case) has a bug, and thus nearly everyone else has to introduce this bug to conform. A curiously common phenomenon in the industry.