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fcall interface

i had a little time to kill Friday evening and had a go
at some basic conversion routines in Limbo for Styx messages.
there were a couple of snags: the format in intro(5) doesn't
always agree with that on the page [intro(5) shows an rauth[13] value in Rattach
that's not shown by attach(5)]; and the values of the Txxx/Rxxx constants
aren't given.  i can assume that attach(5) is accurate (ie, that authentication
has been moved out of the file service protocol proper, where it is in 9P),
and perhaps most of the Txxx/Rxxx values are as in 9P, but Tattach/Rattach
in particular have different formats from 9P and thus (possibly) new values.
if so, what are they?