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calibre does not duplicate entries. It creates entries in the /Info dictionary and in the XMP metadata block, using the standard Dublin Core metadata namespace, because both are needed for different PDF reading apps.
As for author conventions, calibre uses it's own author conventions. There is no universal multi author convention for author metadata in PDF info keys. In XMP metadata multiple authors are represented using multiple an rdf sequence, which is the correct way to represent multiple entries in XMP.
I suggest you spend some time educating yourself about PDF metadata.
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