We updated and started getting this warning everywhere:

Warning: Any use of a keyed object should be wrapped in React.addons.createFragment(object) before being passed as a child.

Took me a while to realize that it was because we were using Number instances in our jsx.

I wonder if it would be acceptable to apply .valueOf() first (if present) to legalize this situation?

// Obviously we're not literally doing this:
<span>{new Number(5)}</span>