Yeah the pubdate is looked up via xisbn during the merging process and the earliest pubdate is used.
Note that merging of results means that it is hopeless to try to use a "particular edition" in the new code. If you want details for a particular edition, you are going to have to enter them manually.
Take a look at the merging code it isn;t too mysetrious (I hope) its in sources.identify
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