To summarize:
Case one: When I select one book and change the author to something else, that one book is affected. This is good.
Case two: When I select one book and change the author only in case (e.g. "unknown" to "Unknown"), all books currently having that value as author are affected.
IMHO the latter behaviour is undesired. If I would want to change all authors, I can select all and replace all. But I have no way to avoid the mass affecting behaviour - in particilar if it happens during bulk import.
I would propose that, if an author is changed in case only, the change is refused.
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