Newtypes instead of monolithic id

[fkaa]

Is there any reasoning for using traits and implementing them onto id rather than creating newtypes such as struct NSString(id)? I've been running into name collisions with the former a lot lately.

[jdm]

I would be in favour of making this change; @pcwalton can you think of any reason not to?

[jdm]

@metajack Any objection here?

[metajack]

This is a question best answered by @pcwalton. It might help in decision making to see a concrete example of how this changes things before and after.

[fkaa]

I've had some success with this inside my own bindings, and I can definitely see the use for this here.