But, MUST do TLS 1.3 implies (to me), do *NOT* (refuse to) do TLS 1.2. 

The only way to allow (MAY) TLS 1.2, is for TLS 1.3 to be SHOULD. 


People who believe that have not read the draft, or forgotten something. It’s 
pretty clear, appearing in the very next paragraph aftrer the MUST TLS 1.3 
paragraph: 
If deployment considerations are a concern, the protocol MAY specify TLS 1.2 as 
an additional, non-default option. 



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