Reduce general diff with eigen-tip. Moreover, this test now seems to pass again.
Reduce general diff with eigen-tip. Moreover, this test now seems to pass
again.

cjntaylor/eigen,pthulhu/eigen,cjntaylor/eigen,pthulhu/eigen,pthulhu/eigen,pthulhu/eigen,cjntaylor/eigen,pthulhu/eigen,cjntaylor/eigen