In response to https://bugs.gentoo.org/show_bug.cgi?id=546642. There have also been many bugfixes between 0.12 and 0.12.6. 0.12.6 has been pushed to the tree on 2016-02-16 so I hope that if no bug arises until 03-19, this version could be finally marked as stable.
I think it won't hurt to stabilize it already, considering it's a major bugfix over current stable. Target keywords: amd64 ppc x86
amd64 stable
x86 stable
ppc stable. Closing.