Exception: ToDo: hGetBuf - when using custom handle infrastructure
When trying to use the custom handle infrastructure, hGetContents fails like so:
*** Exception: ToDo: hGetBufThis exception occurs twice in GHC.IO.Handle.Text
The handle implementation I'm using is attached.
It would be neat if I could pass along some witness that my device implements RawDevice, then we could just run the same code that we use for file-descriptors. But I'd be happy enough with a general solution, as I just plan to use this for testing.