Bump to v4.12.0.

_setCacheAdd.js

@@ -0,0 +1,22 @@
+define([], function() {
+
+  /** Used to stand-in for `undefined` hash values. */
+  var HASH_UNDEFINED = '__lodash_hash_undefined__';
+
+  /**
+   * Adds `value` to the array cache.
+   *
+   * @private
+   * @name add
+   * @memberOf SetCache
+   * @alias push
+   * @param {*} value The value to cache.
+   * @returns {Object} Returns the cache instance.
+   */
+  function setCacheAdd(value) {
+    this.__data__.set(value, HASH_UNDEFINED);
+    return this;
+  }
+
+  return setCacheAdd;
+});