Chris Smith
It would be a shame if we lost an occasionally useful and easy to read
You forgot "confusing"? Expecting Enum to enumerate all inhabitants of a type seems very reasonable to me, and seems to hold for all non-floating point types. A numeric range [a..a+n] might be expected to have a+n+1 elements, but that doesn't hold either for Float and Double. I think Enum for floating point values is broken - but it is reality, so we need to deal with it.
Instead, perhaps the issue should be brought up with the fixed-point number library you're using, and they could fix their Enum instance to be more helpful.
Or just avoid Enum, and define "range" or something similar instead. -k -- If I haven't seen further, it is by standing in the footprints of giants