Don't abuse NotImplementedError.
Don't abuse NotImplementedError.

So that we can distinguish between types we can't support, and those we
can support, but haven't.

surround-io/apitrace,swq0553/apitrace,EoD/apitrace,schulmar/apitrace,tuanthng/apitrace,swq0553/apitrace,EoD/apitrace,trtt/apitrace,trtt/apitrace,surround-io/apitrace,tuanthng/apitrace,trtt/apitrace,PeterLValve/apitrace,swq0553/apitrace,apitrace/apitrace,apitrace/apitrace,joshua5201/apitrace,schulmar/apitrace,surround-io/apitrace,joshua5201/apitrace,schulmar/apitrace,schulmar/apitrace,surround-io/apitrace,joshua5201/apitrace,EoD/apitrace,EoD/apitrace,swq0553/apitrace,PeterLValve/apitrace,tuanthng/apitrace,tuanthng/apitrace,joshua5201/apitrace,joshua5201/apitrace,trtt/apitrace,PeterLValve/apitrace,PeterLValve/apitrace,swq0553/apitrace,surround-io/apitrace,EoD/apitrace,trtt/apitrace,apitrace/apitrace,schulmar/apitrace,apitrace/apitrace,tuanthng/apitrace