function toArray(children) {
	  var result = [];
	  mapIntoWithKeyPrefixInternal(children, result, null, emptyFunction.thatReturnsArgument);
	  return result;
	}
Flatten a children object (typically specified as `props.children`) and
return an array with appropriately re-keyed children.

See https://facebook.github.io/react/docs/top-level-api.html#react.children.toarray