Move internal modules to “internal” folder.

.internal/castArrayLikeObject.js

@@ -0,0 +1,14 @@
+import isArrayLikeObject from './isArrayLikeObject.js';
+
+/**
+ * Casts `value` to an empty array if it's not an array like object.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {Array|Object} Returns the cast array-like object.
+ */
+function castArrayLikeObject(value) {
+  return isArrayLikeObject(value) ? value : [];
+}
+
+export default castArrayLikeObject;