I would like to discuss a bit more issues like: https://bugs.gentoo.org/show_bug.cgi?id=423087
Even if there are "a lot" of packages that can cause this breakage when downgraded, I think it should be prevented and package managers shouldn't try to downgrade this kind of packages as they will later cause a total breakage. People is not supposed to know that downgrading some package system will, for example, have an unusable gcc.
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