>>> why does a package from official repositories mentions what version >>> of a dependency is required? >> Because it may be that it is working only with that particular >> version. > That doesn't explain why it is needed or in any way useful for a package > provided by official Arch repositories? Partial upgrades are > unsupported [1]. Actually it could be vary annoying, if packages now > start including the version of a dependency. I didn't notice that > packages mention dependency versions for at least the last 4 years [2]. > It's not the only dummy package I'm using for at least that long. No one > said people are allowed to install only packages from official repos. You have yourself delivered an example of a package that had pulseaudio listed in its provides entry.
Another case: sometimes multiple packages in the official repo may deliver the same thing: see jre8-openjdk and jre7-openjdk — different versions of the java-runtime. Or mysql (*now* no longer in official repos) and mariadb: different implemenations of the same flavour of RDBMS.
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