> > Well it depends what policy we want. Looking at the file most entries have 
> > both even if only one protocol is effectively in use.
> 
> Looking at the file though, most of those are older entries - I think

Yes. The reason is this:
"
# Note that it is presently the policy of IANA to assign a single well-known
# port number for both TCP and UDP; hence, most entries here have two entries
# even if the protocol doesn't support UDP operations.
"

> new entries should be specific, and where we have knowledge of the
> protocols we should remove silly old ones. BGP, Gopher, HTTP, POP,
> and IMAP over UDP look like good candidates for example..

I am all in favor of cleaning this file and removing useless entries.
But be careful, this is not a user-editable file anymore, so we need to take 
into account that some stuffs that may not appear obvious to us may still be 
needed by people.

-- 
Antoine

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