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how to get the unique_subject setting in cnf file to work

Hi there. I'm trying to understand how the unique_subject setting in the openssl cnf file works. I've tried changing the value from a no to a yes but it doesn't seem to prevent me from creating and approving certificates that are identical to eachother as far as user supplied information is

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I’m trying to understand some code someone wrote as a wrapper for the openssl library / tool, with a view to updating it. I'm completely new to openssl and PKI in general. I found the following docs / references to help navigate but I wasn't able to find answer to my question.