> No attempt is made in the document to explain how/why the reduction in size of
> some standard LISP header fields is acceptable. For example, if 
> implementations
> of this spec can safely operate with a 16 bit Nonce or 8 bit Map-Versions, why
> does 6830/6830bis feel the need for 24 and 12 bit fields rspectively?

Note, you misread RFC6830. The Map-Version field is 24-bits when the V bit is 
set. And is divided up like this:

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |N|L|E|V|I|flags|  Source Map-Version   |   Dest Map-Version    |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                 Instance ID/Locator-Status-Bits               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Dino

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