Bump to v3.0.0.

internal/setData.js

@@ -0,0 +1,41 @@
+define(['./baseSetData', '../date/now'], function(baseSetData, now) {
+
+  /** Used to detect when a function becomes hot. */
+  var HOT_COUNT = 150,
+      HOT_SPAN = 16;
+
+  /**
+   * Sets metadata for `func`.
+   *
+   * **Note:** If this function becomes hot, i.e. is invoked a lot in a short
+   * period of time, it will trip its breaker and transition to an identity function
+   * to avoid garbage collection pauses in V8. See [V8 issue 2070](https://code.google.com/p/v8/issues/detail?id=2070)
+   * for more details.
+   *
+   * @private
+   * @param {Function} func The function to associate metadata with.
+   * @param {*} data The metadata.
+   * @returns {Function} Returns `func`.
+   */
+  var setData = (function() {
+    var count = 0,
+        lastCalled = 0;
+
+    return function(key, value) {
+      var stamp = now(),
+          remaining = HOT_SPAN - (stamp - lastCalled);
+
+      lastCalled = stamp;
+      if (remaining > 0) {
+        if (++count >= HOT_COUNT) {
+          return key;
+        }
+      } else {
+        count = 0;
+      }
+      return baseSetData(key, value);
+    };
+  }());
+
+  return setData;
+});