Proposal: Add strict iterate'

[David Feuer]

I think most if not all applications of iterate would prefer to accumulate
strictly—iterating a constant function is not very useful and the spine of
the result of iterate is always the same. Unlike unfoldr, which has enough
strictness built in to allow its caller to decide whether to accumulate
strictly, iterate is entirely lazy. I therefore propose:

iterate' :: (a -> a) -> a -> [a]
iterate' f b = unfoldr go b
  where
    go x = x `seq` Just (x, f x)
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