handling nulls

[paolino]

I'm using a lot this wrapper to parse maybes

nullIsNothing :: Prism' Value q -> Prism' Value (Maybe q)
nullIsNothing p = prism'
  do
    \case
      Nothing -> Null
      Just q -> review p q
  do
    \case
      Null -> Just Nothing
      x -> Just <$> preview p x

Would you insert it ?

[PaulJohnson]

I'll second that. Pull request submitted. There may be a cleverer way of doing this with the existing lens combinators, but if so then I haven't figured it out.

[ekmett]

non Null :: Iso' Value (Maybe Value)

can be composed with another prism (or lens or anything else, really)