What is up with glibc in rawhide?

[Tom Lane <tgl redhat com>]

glibc-2.9.90-12 is badly broken (bz #494631).  Yesterday it was
replaced with -14, which is less broken.  Today it's back to -12.
How is anyone supposed to get a stable release out when we are churning
experimental versions of core system components?

			regards, tom lane