Roger,
I did a quick test with a file created and saved in Sigil (I'm new with the Calibre eBook-Edit).
Then the file was imported into the Calibre eBook-Edit module. I applied "Beautify all files", save the file and loaded the epub on my Kobo and Sony: both were displayed the files perfectly.
So it seems, from a practical point of view at least for my Kobo and Sony, that both specs work as expected.
And, by the way, the files passed epubcheck without a hitch.
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