please allow downgrade of glibc and don't die in ebuild, at least within the same version (2.4-r4 -> 2.4-r3) i installed glibc-2.4-r4 and experienced heavy problems on x86, so want to make sure that glibc is stable maybe a version specific variable to override downgrade-block or something... ...actually downgrade of glibc is possible without too much risk, as long as you didn't recompile system and toolchain...
No, period. It breaks hell out of users.
*** Bug 151059 has been marked as a duplicate of this bug. ***
Maybe the cure is worse than the initial problem (see #151059)