Paul Hoffman writes:
> RFC 4306 says:
>    Although new payload types may be added in the future and may appear
>    interleaved with the fields defined in this specification,
>    implementations MUST send the payloads defined in this specification
>    in the order shown in the figures in section 2 and implementations
>    SHOULD reject as invalid a message with those payloads in any other
>    order.
> 
> a) Downgrade the MUST to a SHOULD without other changes.

I think that should be fine, but I think more important would be to
change "SHOULD reject" to "SHOULD NOT reject" or even "MUST NOT
reject". As I do not think anybody currently follows this SHOULD I
think that should not make any current real implementations
incompatible with new versions.
-- 
kivi...@iki.fi
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