Proposal: Data.Functor.<.> for `fmap f2 . f1`

[Marcin Mrotek]

Hello,

Lens also uses it for combining indexed lenses:
https://hackage.haskell.org/package/lens-4.13/docs/Control-Lens-Indexed.html#v:-60-.-62-

Best regards,
Marcin Mrotek
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