| It seems you might benefit from local functional dependencies, which
| are asserted per instance rather than for the whole class. They are
| explained in
|
| http://pobox.com/~oleg/ftp/Haskell/typecast.html
Unfortunately I come crawling back with a failure. Either my fu was
not strong
Yes, this will surely do the trick, thanks a lot! :-)
I got as far as defining a TypeEq class myself in one of my attempts,
trying to trick the inference engine, but now seeing the full
ingenuity of the TypeCast class I realize how far from the solution I
really was. Again, thanks a million!
