function shallowEqual(objA, objB) {
	  if (is(objA, objB)) {
	    return true;
	  }

	  if (typeof objA !== 'object' || objA === null || typeof objB !== 'object' || objB === null) {
	    return false;
	  }

	  var keysA = Object.keys(objA);
	  var keysB = Object.keys(objB);

	  if (keysA.length !== keysB.length) {
	    return false;
	  }

	  // Test for A's keys different from B.
	  for (var i = 0; i < keysA.length; i++) {
	    if (!hasOwnProperty.call(objB, keysA[i]) || !is(objA[keysA[i]], objB[keysA[i]])) {
	      return false;
	    }
	  }

	  return true;
	}
Performs equality by iterating through keys on an object and returning false
when any key has values which are not strictly equal between the arguments.
Returns true when the values of all keys are strictly equal.