I'm really excited for `React.cloneElement` and inlining of `React.createElement`! `React.cloneElement` makes a bunch of tricks that used to require hacks much

I'm really excited for `React.cloneElement` and inlining of `React.createElement`! `React.cloneElement` makes a bunch of tricks that used to require hacks much cleaner, and finally promotes cloneWithProps to non-addon API and removes the confusing magic. And if `React.cloneElement` starts getting compiled into object literals it's going to speed up large render calls significantly, and make the overall React API feel a bit simpler (to me).