more work

node_modules/lodash/internal/createCache.js

@@ -0,0 +1,22 @@
+var SetCache = require('./SetCache'),
+    constant = require('../utility/constant'),
+    isNative = require('../lang/isNative');
+
+/** Native method references. */
+var Set = isNative(Set = global.Set) && Set;
+
+/* Native method references for those with the same name as other `lodash` methods. */
+var nativeCreate = isNative(nativeCreate = Object.create) && nativeCreate;
+
+/**
+ * Creates a `Set` cache object to optimize linear searches of large arrays.
+ *
+ * @private
+ * @param {Array} [values] The values to cache.
+ * @returns {null|Object} Returns the new cache object if `Set` is supported, else `null`.
+ */
+var createCache = !(nativeCreate && Set) ? constant(null) : function(values) {
+  return new SetCache(values);
+};
+
+module.exports = createCache;