Supposing you need to do this kind of stuff a lot, one fairly nice workaround is to subclass the base class and then use that subclass when you need added mutat

Supposing you need to do this kind of stuff a lot, one fairly nice workaround is to subclass the base class and then use that subclass when you need added mutative and/or chain able functionality. The drawback in this case is it's not as concise as just typing in a String literal :)