Proposal: flipped fmap in base (again)

[Siddhanathan Shanmugam]

This was proposed about 7 years ago, and rejected at the time:
https://ghc.haskell.org/trac/ghc/ticket/3962

 Is it okay if I revive this argument now?

I think it would be useful to have the lens operator <&> in base, which is
defined as:

(<&>) :: Functor f => f a -> (a -> b) -> f b
as <&> f = f <$> as

This is analogous to a lifted version of (&) that already present in
Data.Function


Cheers,
Sid
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