it has docs for APDuplexRequiresFlippedMargin. Unfortunately it indicates that the default is True. While that might have been an appropriate default, that is not the way it is implemented. The default is false and if vendors want the raster margins flipped on the back side then they need to add *APDuplexRequiresFlippedMargin: True
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Um, if the default is False then you have incompatibly changed the behavior of cupsFlipDuplex... The standard CUPS RIPs have ALWAYS flipped the top/bottom margins when cupsFlipDuplex is True, and that is the documented and expected behavior.
So, I can certainly change the documentation to read "the default is to follow the cupsFlipDuplex attribute" (or something like that), but if you are not flipping the margins by default when cupsFlipDuplex is True, you need to fix that in cgpdftoraster, etc.