Bump to v4.1.0.

_cachePush.js

@@ -0,0 +1,28 @@
+define(['./_isKeyable'], function(isKeyable) {
+
+  /** Used to stand-in for `undefined` hash values. */
+  var HASH_UNDEFINED = '__lodash_hash_undefined__';
+
+  /**
+   * Adds `value` to the set cache.
+   *
+   * @private
+   * @name push
+   * @memberOf SetCache
+   * @param {*} value The value to cache.
+   */
+  function cachePush(value) {
+    var map = this.__data__;
+    if (isKeyable(value)) {
+      var data = map.__data__,
+          hash = typeof value == 'string' ? data.string : data.hash;
+
+      hash[value] = HASH_UNDEFINED;
+    }
+    else {
+      map.set(value, HASH_UNDEFINED);
+    }
+  }
+
+  return cachePush;
+});