When looking for changes at revision zero, look for file creation.
This fixes the symptom described in but not the problem.
$(rov [-.rov mol `+(u.aey) ~ ~])
:: if old isn't complete, try filling in the gaps.
=? old !(complete old)
+ :: if we're looking for changes in revision zero, then the previous
+ :: revision only has "file does not exist" results.
+ ?: =(u.yon 0)
+ %- ~(gas by *(map (pair care path) cach))
+ %+ turn ~(tap in q.mol)
+ |=(r=(pair care path) [r [~ ~]])
(read-unknown mol(p [%ud (dec u.yon)]) old)
:: if the next aeon we want to compare is in the future, wait again.
=+ aey=(case-to-aeon:ze [%ud u.yon])
