Function isArray

test/babel.js:11023–11025

(ar)

	// NOTE: These type checking functions intentionally don't use `instanceof`
	// because it is fragile and can be easily faked with `Object.create()`.
	function isArray(ar) {
	  return Array.isArray(ar);
	}
	exports.isArray = isArray;

	function isBoolean(arg) {