On Wed, 8 Apr 2009, Neil Mitchell wrote:
That seems a really weird way to write it! Who decided all auxiliary
functions should be called go? (I think I'm blaming dons) - why not:
sffi :: (Integral a,Num a) => Integer -> Maybe a
sffi n | toInteger n2 == n = Just n2
| otherwise = Nothing
where n2 = fromInteger n
I think it is a bug, that 'fromInteger' is defined for numbers outside the
range of the target type. Why is it necessary to have, say
fromInteger 1000 == (232 :: Word8)
?
I would not rely on this behaviour and safeFromInteger should also work,
when the fromInteger method yields undefined for some Integer input.
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