kibi wrote this on #debian-devel: mbiebl: disclaimer = I had never looked at its source until 10 minutes ago
mbiebl: _determinefromversion() looks like it returns the “from” (= last version that was seen) on a per-source fashion, so if you upgrade say systemd then udev, udev was already “seen” in that version.
via: if srcpackage in seen_db: return seen_db[srcpackage]
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