more work

node_modules/lodash/internal/SetCache.js

@@ -0,0 +1,29 @@
+var cachePush = require('./cachePush'),
+    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 cache object to store unique values.
+ *
+ * @private
+ * @param {Array} [values] The values to cache.
+ */
+function SetCache(values) {
+  var length = values ? values.length : 0;
+
+  this.data = { 'hash': nativeCreate(null), 'set': new Set };
+  while (length--) {
+    this.push(values[length]);
+  }
+}
+
+// Add functions to the `Set` cache.
+SetCache.prototype.push = cachePush;
+
+module.exports = SetCache;