Bump to v4.12.0.

_setCacheHas.js

@@ -0,0 +1,17 @@
+define([], function() {
+
+  /**
+   * Checks if `value` is in the array cache.
+   *
+   * @private
+   * @name has
+   * @memberOf SetCache
+   * @param {*} value The value to search for.
+   * @returns {number} Returns `true` if `value` is found, else `false`.
+   */
+  function setCacheHas(value) {
+    return this.__data__.has(value);
+  }
+
+  return setCacheHas;
+});