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Excerpts from stuart.mclaren's message of 2013-08-07 02:13:15 -0700:
> 
> Typically its the not-very-interesting case of changing
> the size from 0 to the real size after the data has uploaded.
> 
> That happens before the image state transitions to 'active'.
> 

Shouldn't the size be NULL, not 0, since it is unknown?

If that is the case, seems like you should be able to reliably allow a
transition from NULL to a value, but not from a value to anything else.