So as soon as I got home last night I remembered something.  What may
be helpful is that perhaps the content at the TUK contains both an expected
update date as well as the content previously discussed.  This way, if a 
TUK is retrieved after only a few hops, but the expected update date has
not yet occurred, the value in that TUK version is used.  However, if the
expected update date has passed, another request goes out (at HTL 15?
at an HTL specified in the SSK via TUK.updateSearchHTL=?), and the 
most recent TUK value is found.  This way, TUKs won't necessarily be
searched for at a full HTL depth always, but in the case that the TUK isn't
retrievable or the suggested update date has passed, the full HTL will
be used.

Also, I don't think the TUK content should be limited by fred to be a small
size (e.g. 1k as discussed on IRC).  For normal freenet publishing 
purposes, yes it should be severely limited when interpreted through the
.UseTUK= metadata flag to be a single value ([0-9a-zA-Z]*), but I can imagine
FMB and other similar systems using a single inbox or outbox containing
their messages, rather than relying on the 
SSK@<key>,<entropy>/fmb/<date>/<slotNum>

(yikes, I can't believe it took over a full hour for my post last night to go
through.  damn thee mailmain && / || cryptomail!)

So, um, er, thoughts?

-jrandom

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