Why is the behavior of the Haskell range notation different for floats than for integers and chars?

Prelude> [1, 3 .. 10] :: [Int]
[1,3,5,7,9] 
Prelude> [1, 3 .. 10] :: [Float]
[1.0,3.0,5.0,7.0,9.0,11.0]
Prelude> ['a', 'c' .. 'f']
"ace"

I would understand it if the last element was close to the upper bound, but this is obviously not a rounding issue.

haskell floating-point range-notation
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