And I am waiting for you to provide some evidence that Kobo on their epub spec GitHub page officially suggests renaming from .epub to .kepub.epub to correct issues with footnotes. So far you have not managed to supply that information.
Until such time as you manage to read the ePub 3.3 spec and see how much of the standard is not labelled as MUST, I am going to keep any interaction with you to a minimum.
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