diff --git a/README.md b/README.md
index 1bccc8c1b..025bbb6b7 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# lodash v3.1.4
+# lodash v3.1.5
 
 The [lodash](https://lodash.com/) library exported as [npm packages](https://www.npmjs.com/browse/keyword/lodash-modularized) per method.
 
diff --git a/lodash._basematches/README.md b/lodash._basematches/README.md
index 4dec912d1..696cc325b 100644
--- a/lodash._basematches/README.md
+++ b/lodash._basematches/README.md
@@ -1,4 +1,4 @@
-# lodash._basematches v3.1.4
+# lodash._basematches v3.1.5
 
 The [modern build](https://github.com/lodash/lodash/wiki/Build-Differences) of [lodash’s](https://lodash.com/) internal `baseMatches` exported as a [Node.js](http://nodejs.org/)/[io.js](https://iojs.org/) module.
 
@@ -17,4 +17,4 @@ In Node.js/io.js:
 var baseMatches = require('lodash._basematches');
 ```
 
-See the [package source](https://github.com/lodash/lodash/blob/3.1.4-npm-packages/lodash._basematches) for more details.
+See the [package source](https://github.com/lodash/lodash/blob/3.1.5-npm-packages/lodash._basematches) for more details.
diff --git a/lodash._basematches/index.js b/lodash._basematches/index.js
index e9a4812d7..3bed8b331 100644
--- a/lodash._basematches/index.js
+++ b/lodash._basematches/index.js
@@ -1,5 +1,5 @@
 /**
- * lodash 3.1.4 (Custom Build) <https://lodash.com/>
+ * lodash 3.1.5 (Custom Build) <https://lodash.com/>
  * Build: `lodash modern modularize exports="npm" -o ./`
  * Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
@@ -58,7 +58,7 @@ function baseMatches(source) {
  *  equality comparisons, else `false`.
  */
 function isStrictComparable(value) {
-  return value === value && (value === 0 ? ((1 / value) > 0) : !isObject(value));
+  return value === value && !isObject(value);
 }
 
 /**
diff --git a/lodash._basematches/package.json b/lodash._basematches/package.json
index f07f9622a..6ae9ed51e 100644
--- a/lodash._basematches/package.json
+++ b/lodash._basematches/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash._basematches",
-  "version": "3.1.4",
+  "version": "3.1.5",
   "description": "The modern build of lodash’s internal `baseMatches` as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
diff --git a/lodash.random/README.md b/lodash.random/README.md
index 44b612d07..e16dc387e 100644
--- a/lodash.random/README.md
+++ b/lodash.random/README.md
@@ -1,4 +1,4 @@
-# lodash.random v3.1.4
+# lodash.random v3.1.5
 
 The [lodash](https://lodash.com/) method `_.random` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -15,4 +15,4 @@ In Node.js:
 var random = require('lodash.random');
 ```
 
-See the [documentation](https://lodash.com/docs#random) or [package source](https://github.com/lodash/lodash/blob/3.1.4-npm-packages/lodash.random) for more details.
+See the [documentation](https://lodash.com/docs#random) or [package source](https://github.com/lodash/lodash/blob/3.1.5-npm-packages/lodash.random) for more details.
diff --git a/lodash.random/index.js b/lodash.random/index.js
index 0b774ef4c..4d41651d0 100644
--- a/lodash.random/index.js
+++ b/lodash.random/index.js
@@ -1,5 +1,5 @@
 /**
- * lodash 3.1.4 (Custom Build) <https://lodash.com/>
+ * lodash (Custom Build) <https://lodash.com/>
  * Build: `lodash modularize exports="npm" -o ./`
  * Copyright jQuery Foundation and other contributors <https://jquery.org/>
  * Released under MIT license <https://lodash.com/license>
@@ -35,20 +35,6 @@ var reIsUint = /^(?:0|[1-9]\d*)$/;
 var freeParseFloat = parseFloat,
     freeParseInt = parseInt;
 
-/**
- * Checks if `value` is a valid array-like index.
- *
- * @private
- * @param {*} value The value to check.
- * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
- * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
- */
-function isIndex(value, length) {
-  value = (typeof value == 'number' || reIsUint.test(value)) ? +value : -1;
-  length = length == null ? MAX_SAFE_INTEGER : length;
-  return value > -1 && value % 1 == 0 && value < length;
-}
-
 /** Used for built-in method references. */
 var objectProto = Object.prototype;
 
@@ -69,7 +55,7 @@ var nativeFloor = Math.floor,
  *
  * @private
  * @param {string} key The key of the property to get.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new accessor function.
  */
 function baseProperty(key) {
   return function(object) {
@@ -103,6 +89,21 @@ function baseRandom(lower, upper) {
  */
 var getLength = baseProperty('length');
 
+/**
+ * Checks if `value` is a valid array-like index.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
+ * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
+ */
+function isIndex(value, length) {
+  length = length == null ? MAX_SAFE_INTEGER : length;
+  return !!length &&
+    (typeof value == 'number' || reIsUint.test(value)) &&
+    (value > -1 && value % 1 == 0 && value < length);
+}
+
 /**
  * Checks if the given arguments are from an iteratee call.
  *
@@ -342,8 +343,8 @@ function isSymbol(value) {
  * @returns {number} Returns the number.
  * @example
  *
- * _.toNumber(3);
- * // => 3
+ * _.toNumber(3.2);
+ * // => 3.2
  *
  * _.toNumber(Number.MIN_VALUE);
  * // => 5e-324
@@ -351,8 +352,8 @@ function isSymbol(value) {
  * _.toNumber(Infinity);
  * // => Infinity
  *
- * _.toNumber('3');
- * // => 3
+ * _.toNumber('3.2');
+ * // => 3.2
  */
 function toNumber(value) {
   if (typeof value == 'number') {
diff --git a/lodash.random/package.json b/lodash.random/package.json
index 23b531ce7..90ed22e68 100644
--- a/lodash.random/package.json
+++ b/lodash.random/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash.random",
-  "version": "3.1.4",
+  "version": "3.1.5",
   "description": "The lodash method `_.random` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
diff --git a/lodash.range/README.md b/lodash.range/README.md
index 4f8251140..cef25bcf0 100644
--- a/lodash.range/README.md
+++ b/lodash.range/README.md
@@ -1,4 +1,4 @@
-# lodash.range v3.1.4
+# lodash.range v3.1.5
 
 The [lodash](https://lodash.com/) method `_.range` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -15,4 +15,4 @@ In Node.js:
 var range = require('lodash.range');
 ```
 
-See the [documentation](https://lodash.com/docs#range) or [package source](https://github.com/lodash/lodash/blob/3.1.4-npm-packages/lodash.range) for more details.
+See the [documentation](https://lodash.com/docs#range) or [package source](https://github.com/lodash/lodash/blob/3.1.5-npm-packages/lodash.range) for more details.
diff --git a/lodash.range/index.js b/lodash.range/index.js
index 0c90e977d..ec5f125b8 100644
--- a/lodash.range/index.js
+++ b/lodash.range/index.js
@@ -1,5 +1,5 @@
 /**
- * lodash 3.1.4 (Custom Build) <https://lodash.com/>
+ * lodash (Custom Build) <https://lodash.com/>
  * Build: `lodash modularize exports="npm" -o ./`
  * Copyright jQuery Foundation and other contributors <https://jquery.org/>
  * Released under MIT license <https://lodash.com/license>
@@ -34,20 +34,6 @@ var reIsUint = /^(?:0|[1-9]\d*)$/;
 /** Built-in method references without a dependency on `root`. */
 var freeParseInt = parseInt;
 
-/**
- * Checks if `value` is a valid array-like index.
- *
- * @private
- * @param {*} value The value to check.
- * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
- * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
- */
-function isIndex(value, length) {
-  value = (typeof value == 'number' || reIsUint.test(value)) ? +value : -1;
-  length = length == null ? MAX_SAFE_INTEGER : length;
-  return value > -1 && value % 1 == 0 && value < length;
-}
-
 /** Used for built-in method references. */
 var objectProto = Object.prototype;
 
@@ -67,7 +53,7 @@ var nativeCeil = Math.ceil,
  *
  * @private
  * @param {string} key The key of the property to get.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new accessor function.
  */
 function baseProperty(key) {
   return function(object) {
@@ -84,7 +70,7 @@ function baseProperty(key) {
  * @param {number} end The end of the range.
  * @param {number} step The value to increment or decrement by.
  * @param {boolean} [fromRight] Specify iterating from right to left.
- * @returns {Array} Returns the new array of numbers.
+ * @returns {Array} Returns the range of numbers.
  */
 function baseRange(start, end, step, fromRight) {
   var index = -1,
@@ -137,6 +123,21 @@ function createRange(fromRight) {
  */
 var getLength = baseProperty('length');
 
+/**
+ * Checks if `value` is a valid array-like index.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
+ * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
+ */
+function isIndex(value, length) {
+  length = length == null ? MAX_SAFE_INTEGER : length;
+  return !!length &&
+    (typeof value == 'number' || reIsUint.test(value)) &&
+    (value > -1 && value % 1 == 0 && value < length);
+}
+
 /**
  * Checks if the given arguments are from an iteratee call.
  *
@@ -376,8 +377,8 @@ function isSymbol(value) {
  * @returns {number} Returns the number.
  * @example
  *
- * _.toNumber(3);
- * // => 3
+ * _.toNumber(3.2);
+ * // => 3.2
  *
  * _.toNumber(Number.MIN_VALUE);
  * // => 5e-324
@@ -385,8 +386,8 @@ function isSymbol(value) {
  * _.toNumber(Infinity);
  * // => Infinity
  *
- * _.toNumber('3');
- * // => 3
+ * _.toNumber('3.2');
+ * // => 3.2
  */
 function toNumber(value) {
   if (typeof value == 'number') {
@@ -425,7 +426,8 @@ function toNumber(value) {
  * @param {number} [start=0] The start of the range.
  * @param {number} end The end of the range.
  * @param {number} [step=1] The value to increment or decrement by.
- * @returns {Array} Returns the new array of numbers.
+ * @returns {Array} Returns the range of numbers.
+ * @see _.inRange, _.rangeRight
  * @example
  *
  * _.range(4);
diff --git a/lodash.range/package.json b/lodash.range/package.json
index 345fb2be4..ae8262f82 100644
--- a/lodash.range/package.json
+++ b/lodash.range/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash.range",
-  "version": "3.1.4",
+  "version": "3.1.5",
   "description": "The lodash method `_.range` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
diff --git a/lodash.sortby/LICENSE.txt b/lodash.sortby/LICENSE
similarity index 100%
rename from lodash.sortby/LICENSE.txt
rename to lodash.sortby/LICENSE
diff --git a/lodash.sortby/README.md b/lodash.sortby/README.md
index d61fb62ad..4d1fc54ea 100644
--- a/lodash.sortby/README.md
+++ b/lodash.sortby/README.md
@@ -1,4 +1,4 @@
-# lodash.sortby v3.1.4
+# lodash.sortby v3.1.5
 
 The [modern build](https://github.com/lodash/lodash/wiki/Build-Differences) of [lodash’s](https://lodash.com/) `_.sortBy` exported as a [Node.js](http://nodejs.org/)/[io.js](https://iojs.org/) module.
 
@@ -17,4 +17,4 @@ In Node.js/io.js:
 var sortBy = require('lodash.sortby');
 ```
 
-See the [documentation](https://lodash.com/docs#sortBy) or [package source](https://github.com/lodash/lodash/blob/3.1.4-npm-packages/lodash.sortby) for more details.
+See the [documentation](https://lodash.com/docs#sortBy) or [package source](https://github.com/lodash/lodash/blob/3.1.5-npm-packages/lodash.sortby) for more details.
diff --git a/lodash.sortby/index.js b/lodash.sortby/index.js
index 647d8b1f7..0a66451f9 100644
--- a/lodash.sortby/index.js
+++ b/lodash.sortby/index.js
@@ -1,5 +1,5 @@
 /**
- * lodash 3.1.4 (Custom Build) <https://lodash.com/>
+ * lodash 3.1.5 (Custom Build) <https://lodash.com/>
  * Build: `lodash modern modularize exports="npm" -o ./`
  * Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
@@ -17,8 +17,8 @@ var baseCallback = require('lodash._basecallback'),
  * sort them in ascending order.
  *
  * @private
- * @param {Object} object The object to compare to `other`.
- * @param {Object} other The object to compare to `object`.
+ * @param {Object} object The object to compare.
+ * @param {Object} other The other object to compare.
  * @returns {number} Returns the sort order indicator for `object`.
  */
 function compareAscending(object, other) {
@@ -26,7 +26,7 @@ function compareAscending(object, other) {
 }
 
 /**
- * Used as the [maximum length](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.max_safe_integer)
+ * Used as the [maximum length](http://ecma-international.org/ecma-262/6.0/#sec-number.max_safe_integer)
  * of an array-like value.
  */
 var MAX_SAFE_INTEGER = 9007199254740991;
@@ -89,7 +89,7 @@ function isArrayLike(value) {
 /**
  * Checks if `value` is a valid array-like length.
  *
- * **Note:** This function is based on [`ToLength`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength).
+ * **Note:** This function is based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
  *
  * @private
  * @param {*} value The value to check.
@@ -152,7 +152,7 @@ function sortBy(collection, iteratee, thisArg) {
     return [];
   }
   if (thisArg && isIterateeCall(collection, iteratee, thisArg)) {
-    iteratee = null;
+    iteratee = undefined;
   }
   var index = -1;
   iteratee = baseCallback(iteratee, thisArg, 3);
diff --git a/lodash.sortby/package.json b/lodash.sortby/package.json
index b0e7cf5f0..5c646e56e 100644
--- a/lodash.sortby/package.json
+++ b/lodash.sortby/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash.sortby",
-  "version": "3.1.4",
+  "version": "3.1.5",
   "description": "The modern build of lodash’s `_.sortBy` as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",