This envolves adding the requirement, that every Encoding must also be an instance of Eq and Typeable to go into DynEncoding. darcs-hash:20090225035150-a4fee-c7d902e28313929ee9ffe0c6a6b60d8ff4704ae9
darcs-hash:20090222182246-a4fee-903520e4098e6809877fc55568207f40ebd6fda9