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Funny, I always thought the identifiers would be merged by themselves. It does seem the logical way to do things.
And doing a metadata download right now, and scrutinizing the value of the metadata before and after, shows me I am right -- the mobi-asin is preserved.
mobi-asin will never be downloaded -- it is calibre-specific, used to store the value of the exth 113 MOBI header (a/k/a ASIN). So if you have ever downloaded metadata for a book, and that identifier is still there, it must've been preserved... and I have many such books.
I cannot promise what outdated and downstream-patched versions of calibre will do (yes, calibre is patched downstream by many distros, which sometimes breaks functionality. e.g. cherrypy and content servers with paswords.)
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