Log Message:
Update to 0.10.12.1

changelog:
Changes in version 0.10.12.1

 * Fixed compilation on non-head GHCs

Changes in version 0.10.12.0

 * Export MVector constructor from Data.Vector.Primitive to match Vector's
   (which was already exported).

 * Fix building on GHC 7.9 by adding Applicative instances for Id and Box