Being the shepherd to the Updated partial type signatures proposal (#194, https://github.com/ghc-proposals/ghc-proposals/pull/194), I recommend acceptance. I've posted the rationale behind this recommendation on Github thread (https://github.com/ghc-proposals/ghc-proposals/pull/194#issuecomment-554751379). 

In short: the proposal unifies the treatment of underscores and identifiers beginning with underscores everywhere outside patterns. It also brings more control to partial type signatures.

Please, raise your voices here or there. As usual, silence is understood as an agreement.

Vitaly