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I looked at it briefly when doing the kobo code for calibre 8 but decided it was too much work for a relatively rare condition. Also providing such a mechanism reduces the incentives for plugin developers to update their plugins. Most of the time plugins require very little work to update as calibre is generally a very stable platform. Finally, the largest category of plugins needing such a field is, by it's very nature, unmaintained plugins, which means the plugin author isnt around to update the metadata in their plugin anyway.
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