yr: Use util.utf8.lower.
yr: Use util.utf8.lower.

Former-commit-id: 8b0bd964c5aad9e1f9872d95b8718d5b0f74148a [formerly b1f23536e1787ae0118f578bed6a671ed7ea45f2]
Former-commit-id: 6921f93d9bfa381643633c499a46a1fd6e7d7d95
torhve/ivar2,torhve/ivar2,haste/ivar2,torhve/ivar2