One of the changes[1] in transformers 0.4 is as follows:

0.3:

newtype Identity a = Identity { runIdentity :: a }

0.4:

newtype Identity a = Identity a

runIdentity (Identity x) = x

While this may seem benign, I've already seen three cases where this caused breakage[2][3][4].

Is there a reason for this change in 0.4? If not, I'd like to request moving back to the previous formulation to avoid unnecessary breakage.

Michael