Note [Specialise original body]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-The RhsInfo for a binding keeps the *oringal* body of the binding. We
+The RhsInfo for a binding keeps the *original* body of the binding. We
must specialise that, *not* the result of applying specExpr to the RHS
(which is also kept in RhsInfo). Otherwise we end up specialising a
specialised RHS, and that can lead directly to exponential behaviour.