diff --git a/README.md b/README.md
index 68509a445..aa981c2db 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# lodash v4.9.0
+# lodash v4.9.1
 
 The [lodash](https://lodash.com/) library exported as [npm packages](https://www.npmjs.com/browse/keyword/lodash-modularized) per method.
 
diff --git a/lodash.flatmapdeep/README.md b/lodash.flatmapdeep/README.md
index 6d872c330..f1799df56 100644
--- a/lodash.flatmapdeep/README.md
+++ b/lodash.flatmapdeep/README.md
@@ -1,4 +1,4 @@
-# lodash.flatmapdeep v4.9.0
+# lodash.flatmapdeep v4.9.1
 
 The [lodash](https://lodash.com/) method `_.flatMapDeep` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -15,4 +15,4 @@ In Node.js:
 var flatMapDeep = require('lodash.flatmapdeep');
 ```
 
-See the [documentation](https://lodash.com/docs#flatMapDeep) or [package source](https://github.com/lodash/lodash/blob/4.9.0-npm-packages/lodash.flatmapdeep) for more details.
+See the [documentation](https://lodash.com/docs#flatMapDeep) or [package source](https://github.com/lodash/lodash/blob/4.9.1-npm-packages/lodash.flatmapdeep) for more details.
diff --git a/lodash.flatmapdeep/index.js b/lodash.flatmapdeep/index.js
index f2d937285..fcdb21f2e 100644
--- a/lodash.flatmapdeep/index.js
+++ b/lodash.flatmapdeep/index.js
@@ -57,7 +57,8 @@ var arrayBufferTag = '[object ArrayBuffer]',
 /** Used to match property names within property paths. */
 var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
     reIsPlainProp = /^\w*$/,
-    rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(\.|\[\])(?:\4|$))/g;
+    reLeadingDot = /^\./,
+    rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;
 
 /**
  * Used to match `RegExp`
@@ -100,10 +101,10 @@ var freeSelf = typeof self == 'object' && self && self.Object === Object && self
 var root = freeGlobal || freeSelf || Function('return this')();
 
 /** Detect free variable `exports`. */
-var freeExports = freeGlobal && typeof exports == 'object' && exports;
+var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
 
 /** Detect free variable `module`. */
-var freeModule = freeExports && typeof module == 'object' && module;
+var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
 
 /** Detect the popular CommonJS extension `module.exports`. */
 var moduleExports = freeModule && freeModule.exports === freeExports;
@@ -1384,6 +1385,7 @@ function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
     }
   }
   stack['delete'](array);
+  stack['delete'](other);
   return result;
 }
 
@@ -1544,6 +1546,7 @@ function equalObjects(object, other, equalFunc, customizer, bitmask, stack) {
     }
   }
   stack['delete'](object);
+  stack['delete'](other);
   return result;
 }
 
@@ -1708,7 +1711,7 @@ function indexKeys(object) {
  */
 function isFlattenable(value) {
   return isArray(value) || isArguments(value) ||
-    !!(spreadableSymbol && value && value[spreadableSymbol])
+    !!(spreadableSymbol && value && value[spreadableSymbol]);
 }
 
 /**
@@ -1825,8 +1828,13 @@ function matchesStrictComparable(key, srcValue) {
  * @returns {Array} Returns the property path array.
  */
 var stringToPath = memoize(function(string) {
+  string = toString(string);
+
   var result = [];
-  toString(string).replace(rePropName, function(match, number, quote, string) {
+  if (reLeadingDot.test(string)) {
+    result.push('');
+  }
+  string.replace(rePropName, function(match, number, quote, string) {
     result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
   });
   return result;
diff --git a/lodash.flatmapdeep/package.json b/lodash.flatmapdeep/package.json
index 65974223b..d1ad08142 100644
--- a/lodash.flatmapdeep/package.json
+++ b/lodash.flatmapdeep/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash.flatmapdeep",
-  "version": "4.9.0",
+  "version": "4.9.1",
   "description": "The lodash method `_.flatMapDeep` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
diff --git a/lodash.flatmapdepth/README.md b/lodash.flatmapdepth/README.md
index 1a81833be..c5d157bf4 100644
--- a/lodash.flatmapdepth/README.md
+++ b/lodash.flatmapdepth/README.md
@@ -1,4 +1,4 @@
-# lodash.flatmapdepth v4.9.0
+# lodash.flatmapdepth v4.9.1
 
 The [lodash](https://lodash.com/) method `_.flatMapDepth` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -15,4 +15,4 @@ In Node.js:
 var flatMapDepth = require('lodash.flatmapdepth');
 ```
 
-See the [documentation](https://lodash.com/docs#flatMapDepth) or [package source](https://github.com/lodash/lodash/blob/4.9.0-npm-packages/lodash.flatmapdepth) for more details.
+See the [documentation](https://lodash.com/docs#flatMapDepth) or [package source](https://github.com/lodash/lodash/blob/4.9.1-npm-packages/lodash.flatmapdepth) for more details.
diff --git a/lodash.flatmapdepth/index.js b/lodash.flatmapdepth/index.js
index ce84e74a8..9d2c47af3 100644
--- a/lodash.flatmapdepth/index.js
+++ b/lodash.flatmapdepth/index.js
@@ -59,7 +59,8 @@ var arrayBufferTag = '[object ArrayBuffer]',
 /** Used to match property names within property paths. */
 var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
     reIsPlainProp = /^\w*$/,
-    rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(\.|\[\])(?:\4|$))/g;
+    reLeadingDot = /^\./,
+    rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;
 
 /**
  * Used to match `RegExp`
@@ -117,10 +118,10 @@ var freeSelf = typeof self == 'object' && self && self.Object === Object && self
 var root = freeGlobal || freeSelf || Function('return this')();
 
 /** Detect free variable `exports`. */
-var freeExports = freeGlobal && typeof exports == 'object' && exports;
+var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
 
 /** Detect free variable `module`. */
-var freeModule = freeExports && typeof module == 'object' && module;
+var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
 
 /** Detect the popular CommonJS extension `module.exports`. */
 var moduleExports = freeModule && freeModule.exports === freeExports;
@@ -1401,6 +1402,7 @@ function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
     }
   }
   stack['delete'](array);
+  stack['delete'](other);
   return result;
 }
 
@@ -1561,6 +1563,7 @@ function equalObjects(object, other, equalFunc, customizer, bitmask, stack) {
     }
   }
   stack['delete'](object);
+  stack['delete'](other);
   return result;
 }
 
@@ -1725,7 +1728,7 @@ function indexKeys(object) {
  */
 function isFlattenable(value) {
   return isArray(value) || isArguments(value) ||
-    !!(spreadableSymbol && value && value[spreadableSymbol])
+    !!(spreadableSymbol && value && value[spreadableSymbol]);
 }
 
 /**
@@ -1842,8 +1845,13 @@ function matchesStrictComparable(key, srcValue) {
  * @returns {Array} Returns the property path array.
  */
 var stringToPath = memoize(function(string) {
+  string = toString(string);
+
   var result = [];
-  toString(string).replace(rePropName, function(match, number, quote, string) {
+  if (reLeadingDot.test(string)) {
+    result.push('');
+  }
+  string.replace(rePropName, function(match, number, quote, string) {
     result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
   });
   return result;
diff --git a/lodash.flatmapdepth/package.json b/lodash.flatmapdepth/package.json
index 9b152ae2f..529fa1157 100644
--- a/lodash.flatmapdepth/package.json
+++ b/lodash.flatmapdepth/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash.flatmapdepth",
-  "version": "4.9.0",
+  "version": "4.9.1",
   "description": "The lodash method `_.flatMapDepth` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
diff --git a/lodash.meanby/README.md b/lodash.meanby/README.md
index 5ef4d266f..c593f6600 100644
--- a/lodash.meanby/README.md
+++ b/lodash.meanby/README.md
@@ -1,4 +1,4 @@
-# lodash.meanby v4.9.0
+# lodash.meanby v4.9.1
 
 The [lodash](https://lodash.com/) method `_.meanBy` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -15,4 +15,4 @@ In Node.js:
 var meanBy = require('lodash.meanby');
 ```
 
-See the [documentation](https://lodash.com/docs#meanBy) or [package source](https://github.com/lodash/lodash/blob/4.9.0-npm-packages/lodash.meanby) for more details.
+See the [documentation](https://lodash.com/docs#meanBy) or [package source](https://github.com/lodash/lodash/blob/4.9.1-npm-packages/lodash.meanby) for more details.
diff --git a/lodash.meanby/index.js b/lodash.meanby/index.js
index bb148856c..8e1ded414 100644
--- a/lodash.meanby/index.js
+++ b/lodash.meanby/index.js
@@ -58,7 +58,8 @@ var arrayBufferTag = '[object ArrayBuffer]',
 /** Used to match property names within property paths. */
 var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
     reIsPlainProp = /^\w*$/,
-    rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(\.|\[\])(?:\4|$))/g;
+    reLeadingDot = /^\./,
+    rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;
 
 /**
  * Used to match `RegExp`
@@ -101,10 +102,10 @@ var freeSelf = typeof self == 'object' && self && self.Object === Object && self
 var root = freeGlobal || freeSelf || Function('return this')();
 
 /** Detect free variable `exports`. */
-var freeExports = freeGlobal && typeof exports == 'object' && exports;
+var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
 
 /** Detect free variable `module`. */
-var freeModule = freeExports && typeof module == 'object' && module;
+var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
 
 /** Detect the popular CommonJS extension `module.exports`. */
 var moduleExports = freeModule && freeModule.exports === freeExports;
@@ -1242,6 +1243,7 @@ function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
     }
   }
   stack['delete'](array);
+  stack['delete'](other);
   return result;
 }
 
@@ -1402,6 +1404,7 @@ function equalObjects(object, other, equalFunc, customizer, bitmask, stack) {
     }
   }
   stack['delete'](object);
+  stack['delete'](other);
   return result;
 }
 
@@ -1671,8 +1674,13 @@ function matchesStrictComparable(key, srcValue) {
  * @returns {Array} Returns the property path array.
  */
 var stringToPath = memoize(function(string) {
+  string = toString(string);
+
   var result = [];
-  toString(string).replace(rePropName, function(match, number, quote, string) {
+  if (reLeadingDot.test(string)) {
+    result.push('');
+  }
+  string.replace(rePropName, function(match, number, quote, string) {
     result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
   });
   return result;
diff --git a/lodash.meanby/package.json b/lodash.meanby/package.json
index accd59d89..08ff29e80 100644
--- a/lodash.meanby/package.json
+++ b/lodash.meanby/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash.meanby",
-  "version": "4.9.0",
+  "version": "4.9.1",
   "description": "The lodash method `_.meanBy` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",