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Out of curiosity I made a search in my largest library and got these results, where fileas-search is a tag applied to all EPUBs containing the file-as OPF metadata property, and fileas-search-comma is a tag applied to all in which such property contains a comma:
(tags:"=fileas-search" not tags:"=fileas-search-comma") l:en not a:~^\(\\p{L}\\p{M}*\)+$
3050 items
(tags:"=fileas-search" l:en) not a:~^\(\\p{L}\\p{M}*\)+$
10373 items
So, that's definitely not unusual for publishers to use the FN LN pattern in file-as metadata. One third at least.
(l:en is alias for language:english; BTW the FN LN pattern was found to be frequent if the language is not english)
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