Add support for ArrayBuffer input (#3548)

lib/is.js

@@ -71,6 +71,14 @@ const typedArray = function (val) {
   return false;
 };
 
+/**
+ * Is this value an ArrayBuffer object?
+ * @private
+ */
+const arrayBuffer = function (val) {
+  return val instanceof ArrayBuffer;
+};
+
 /**
  * Is this value a non-empty string?
  * @private
@@ -134,6 +142,7 @@ module.exports = {
   bool: bool,
   buffer: buffer,
   typedArray: typedArray,
+  arrayBuffer: arrayBuffer,
   string: string,
   number: number,
   integer: integer,