Bump to v4.16.0.

_shortOut.js

@@ -0,0 +1,43 @@
+define([], function() {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /** Used to detect hot functions by number of calls within a span of milliseconds. */
+  var HOT_COUNT = 500,
+      HOT_SPAN = 16;
+
+  /* Built-in method references for those with the same name as other `lodash` methods. */
+  var nativeNow = Date.now;
+
+  /**
+   * Creates a function that'll short out and invoke `identity` instead
+   * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
+   * milliseconds.
+   *
+   * @private
+   * @param {Function} func The function to restrict.
+   * @returns {Function} Returns the new shortable function.
+   */
+  function shortOut(func) {
+    var count = 0,
+        lastCalled = 0;
+
+    return function() {
+      var stamp = nativeNow(),
+          remaining = HOT_SPAN - (stamp - lastCalled);
+
+      lastCalled = stamp;
+      if (remaining > 0) {
+        if (++count >= HOT_COUNT) {
+          return arguments[0];
+        }
+      } else {
+        count = 0;
+      }
+      return func.apply(undefined, arguments);
+    };
+  }
+
+  return shortOut;
+});