Bump to v4.0.0.

internal/cloneBuffer.js

@@ -0,0 +1,20 @@
+define(['./Uint8Array'], function(Uint8Array) {
+
+  /**
+   * Creates a clone of `buffer`.
+   *
+   * @private
+   * @param {ArrayBuffer} buffer The array buffer to clone.
+   * @returns {ArrayBuffer} Returns the cloned array buffer.
+   */
+  function cloneBuffer(buffer) {
+    var Ctor = buffer.constructor,
+        result = new Ctor(buffer.byteLength),
+        view = new Uint8Array(result);
+
+    view.set(new Uint8Array(buffer));
+    return result;
+  }
+
+  return cloneBuffer;
+});