I've come to the conclusion that the OpenType font specification is an utter mess.
It seems the big tech companies like Apple, MS, Adobe, IBM all decided to create a universal font spec, and instead of going away and creating a new font spec from scratch, or even carefully selecting the best bits from various formats, it seems that most of the features from most of the existing formats were dumped into a pot, stirred around a bit, and out came OpenType.
And yeah, an OpenType font can contain TT or CFF outlines, and the file extension is more of a polite suggestion as to what it might contain.
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