In this TLS1.3 "MUST" discussion, I don't understand what an:
   "additional, non-default option"

This in section 4.   It then says:

   If the application is using a TLS implementation that supports this,
   and if it knows that the TLS implementation will use the highest
   version supported, then clients SHOULD specify just the minimum
   version they want.  This MUST be TLS 1.3 or TLS 1.2, depending on the
   circumstances described in the above paragraphs.

* How does a client know if there were deployment considerations on the server?
* If we know (at protocol development time) that there are deployment
  considerations, what are we supposed to write?

Finally, how is:
         "You MUST Unless you can't"

not literally what SHOULD is.

--
Michael Richardson <[email protected]>   . o O ( IPv6 IøT consulting )
           Sandelman Software Works Inc, Ottawa and Worldwide




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