diff --git a/lodash.js b/lodash.js
index 63c1a2ba2..39dce7d98 100644
--- a/lodash.js
+++ b/lodash.js
@@ -1622,6 +1622,13 @@
       }
     };
 
+    // Ensure wrappers are instances of `baseLodash`.
+    lodash.prototype = baseLodash.prototype;
+    lodash.prototype.constructor = lodash;
+
+    LodashWrapper.prototype = baseCreate(baseLodash.prototype);
+    LodashWrapper.prototype.constructor = LodashWrapper;
+
     /*------------------------------------------------------------------------*/
 
     /**
@@ -1738,6 +1745,10 @@
       return result;
     }
 
+    // Ensure `LazyWrapper` is an instance of `baseLodash`.
+    LazyWrapper.prototype = baseCreate(baseLodash.prototype);
+    LazyWrapper.prototype.constructor = LazyWrapper;
+
     /*------------------------------------------------------------------------*/
 
     /**
@@ -1801,6 +1812,9 @@
       hash[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
     }
 
+    // Avoid inheriting from `Object.prototype` when possible.
+    Hash.prototype = nativeCreate ? nativeCreate(null) : objectProto;
+
     /*------------------------------------------------------------------------*/
 
     /**
@@ -1909,6 +1923,13 @@
       return this;
     }
 
+    // Add methods to `MapCache`.
+    MapCache.prototype.clear = mapClear;
+    MapCache.prototype['delete'] = mapDelete;
+    MapCache.prototype.get = mapGet;
+    MapCache.prototype.has = mapHas;
+    MapCache.prototype.set = mapSet;
+
     /*------------------------------------------------------------------------*/
 
     /**
@@ -1969,6 +1990,9 @@
       }
     }
 
+    // Add methods to `SetCache`.
+    SetCache.prototype.push = cachePush;
+
     /*------------------------------------------------------------------------*/
 
     /**
@@ -2077,6 +2101,13 @@
       return this;
     }
 
+    // Add methods to `Stack`.
+    Stack.prototype.clear = stackClear;
+    Stack.prototype['delete'] = stackDelete;
+    Stack.prototype.get = stackGet;
+    Stack.prototype.has = stackHas;
+    Stack.prototype.set = stackSet;
+
     /*------------------------------------------------------------------------*/
 
     /**
@@ -5462,13 +5493,13 @@
      * @param {string} string The string to convert.
      * @returns {Array} Returns the property path array.
      */
-    function stringToPath(string) {
+    var stringToPath = memoize(function(string) {
       var result = [];
       toString(string).replace(rePropName, function(match, number, quote, string) {
         result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
       });
       return result;
-    }
+    });
 
     /**
      * Creates a clone of `wrapper`.
@@ -9111,10 +9142,13 @@
         memoized.cache = cache.set(key, result);
         return result;
       };
-      memoized.cache = new memoize.Cache;
+      memoized.cache = new (memoize.Cache || MapCache);
       return memoized;
     }
 
+    // Assign cache to `_.memoize`.
+    memoize.Cache = MapCache;
+
     /**
      * Creates a function that negates the result of the predicate `func`. The
      * `func` predicate is invoked with the `this` binding and arguments of the
@@ -14750,40 +14784,7 @@
 
     /*------------------------------------------------------------------------*/
 
-    // Ensure wrappers are instances of `baseLodash`.
-    lodash.prototype = baseLodash.prototype;
-    lodash.prototype.constructor = lodash;
-
-    LodashWrapper.prototype = baseCreate(baseLodash.prototype);
-    LodashWrapper.prototype.constructor = LodashWrapper;
-
-    LazyWrapper.prototype = baseCreate(baseLodash.prototype);
-    LazyWrapper.prototype.constructor = LazyWrapper;
-
-    // Avoid inheriting from `Object.prototype` when possible.
-    Hash.prototype = nativeCreate ? nativeCreate(null) : objectProto;
-
-    // Add functions to the `MapCache`.
-    MapCache.prototype.clear = mapClear;
-    MapCache.prototype['delete'] = mapDelete;
-    MapCache.prototype.get = mapGet;
-    MapCache.prototype.has = mapHas;
-    MapCache.prototype.set = mapSet;
-
-    // Add functions to the `SetCache`.
-    SetCache.prototype.push = cachePush;
-
-    // Add functions to the `Stack` cache.
-    Stack.prototype.clear = stackClear;
-    Stack.prototype['delete'] = stackDelete;
-    Stack.prototype.get = stackGet;
-    Stack.prototype.has = stackHas;
-    Stack.prototype.set = stackSet;
-
-    // Assign cache to `_.memoize`.
-    memoize.Cache = MapCache;
-
-    // Add functions that return wrapped values when chaining.
+    // Add methods that return wrapped values when chaining.
     lodash.after = after;
     lodash.ary = ary;
     lodash.assign = assign;
@@ -14936,12 +14937,12 @@
     lodash.extend = assignIn;
     lodash.extendWith = assignInWith;
 
-    // Add functions to `lodash.prototype`.
+    // Add methods to `lodash.prototype`.
     mixin(lodash, lodash);
 
     /*------------------------------------------------------------------------*/
 
-    // Add functions that return unwrapped values when chaining.
+    // Add methods that return unwrapped values when chaining.
     lodash.add = add;
     lodash.attempt = attempt;
     lodash.camelCase = camelCase;
@@ -15304,7 +15305,7 @@
       'func': undefined
     }];
 
-    // Add functions to the lazy wrapper.
+    // Add methods to `LazyWrapper`.
     LazyWrapper.prototype.clone = lazyClone;
     LazyWrapper.prototype.reverse = lazyReverse;
     LazyWrapper.prototype.value = lazyValue;