Why is there no MonadMask instance for ExceptT?

Question

Edward Kmett\'s exceptions library does not provide a MonadMask instance for ExceptT.

Ben Gamari once asked about this and then concluded that it was explained

Answer 1

It seems it's no longer true since exceptions v0.9.0 which has been uploaded to the hackage 25 Feb 2018.

P.S. 0.9.0 is considered deprecated, 0.10.0 is recommended to use (see http://hackage.haskell.org/package/exceptions-0.10.0/changelog).