When TLS 1.3 was finally standardized, there was quite a bit of debate about whether in light of the how different it was from TLS 1.2 we should continue to use the 1.3 version number. ISTR that TLS 2 and TLS 4.0 were both floated--though I don't recall SSL 3.4--but eventually the WG decided to stick with the 1.3 version number we had been using throughout the rest of the process.