I make sure that the guid isn’t a permalink in my feeds. The filename that link points to in my case is generated from the title, and so if I change the title for whatever reason, the link changes too. Therefore I use guid with permalink=”false” and then use MTEntryID@MTBlogURL as the ID in the tags, since that will be unique for an entry and won’t change if I edit the title of the entry.
You comment about retaining link for backwards compatibility is a good one though.
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