Stop defensively copying style object in DOMComponent._updateDOMProperties #2008
Description
Right now, we copy it in one of the hottest paths of React to allow users to mutate the style object afterward. I've come to realize that this pattern doesn't come up that often, since the style's often created inline inside render and not retained after that.
Additionally, Object.assign is coming soon, so people could always clone the style themselves if there's the need.