Address the exceptionally high build time.

[andersio]

Swift 3 compiler is less performant in situations that need sophisticated inference. It appears not to be an issue for Swift 4 though. 💁‍♂️

While the constraints have been tightened, IMO it shouldn't be considered API breaking, since the Property requirements mandate NoError, and the Error associated type is just an implementation detail that is always NoError at conformance time.

Ideally we would get rid of these in RAS 3.0 by constraining PropertyProtocol with Error == NoError.

Checklist

• Updated CHANGELOG.md.

[mdiep]

Changes to type constraints always make me nervous because of the potential to change the type inference. 🙈

[mdiep]

Would adding associatedtype Error = NoError directly on PropertyProtocol have the same effect?

If not, I'm 👍 on this.

[andersio]

master and default type for Error:

This branch:

It seems somehow the problem isn't severe in master now. But I did manage to blow it up to minutes in #444 when dealing with some compiler nonsenses. 🙈