1) Would it make sense to require in some way an explicit upgrade from version <= 28 in order to use feature flags, rather than automatically upgrading the pool to 5000 if any feature flag is set?
2) Is there any under-the-hood difference between a zpool create -o version=28 pool and a zpool create -d pool? 3) If all feature flags are returned to a disabled state (or never were in an enabled or active state), is there any reason not to allow a downgrade from 5000 to 28?
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