FlightCrew tries to follow the ePub 2 specification as published, not the IDPF validator behaviour. In some points the specificatios is rather ambiguous and FlightCrew's and IDPF validator's interpretations differ. Unless the latter is considered as normative, I don't think we can say one or the other is wrong.
And this, of course, has nothing to do with whether a particular code will work as intended in real-world devices.
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