(By the way mtl-style type classes can be abstracted over, for example see my article: http://h2.jaguarpaw.co.uk/posts/mtl-style-for-free/ http://h2.jaguarpaw.c

(By the way mtl-style type classes can be abstracted over, for example see my article: http://h2.jaguarpaw.co.uk/posts/mtl-style-for-free/ http://h2.jaguarpaw.co.uk/posts/mtl-style-for-free/)