Installer to archive changed pages during upgrade or adopt phpBB style upgrader
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Suggest: Installer to archive changed pages during upgrade
I suggest that at the very least, the Installer archives changed pages during the upgrade process in order to stop the obvious over-writing of modifications. A choice being whether to download such a zipped file and/or to archive it on the server.
My preferences would be that we adopt adopt a phpBB-style upgrader which was able to check diffs and offer a choice of merging or over-writing.