[Imap-protocol] condstore mod-sequence 0

In section 3.3.1 of RFC 4551 it says for FETCH to only return messages
where the mod-sequence of the message is "bigger than" that specified (i.e.
">").  However, it seems reasonable for clients to be able to say "FETCH
... (CHANGEDSINCE 0)" and retrieve *all* messages (AFAICT thunderbird does
this initially), however 0 isn't "bigger than" any valid value that we may
store for the mod-sequence of a message.

How do other folks handle this?  Is 0 explicitly special cased to mean "do
not filter anything" in the server implementation even though (based on my
reading) against the letter of the RFC?

Interestingly enough in SEARCH MODSEQ (in section 3.4) is explicitly ">=".
 Seems a little incongruent, not sure if it's intentional or not.

Thanks for your time,
John

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