Remove Enum from Float and Double

[harry]

Tillmann Rendel <rendel at ...> writes:

> In general, I would be against removing features just because they are 
> confusing for beginners. I don't think that's a good design principle 
> for a language that is primarily targeted at professional programmers 
> and computer scientists.

They're confusing to beginners because they don't have consistent or
sensible semantics. That should bother the professional programmers and
computer scientists too!