diff --git a/lodash.js b/lodash.js
index b0bdabe4b..c96149ad7 100644
--- a/lodash.js
+++ b/lodash.js
@@ -710,35 +710,6 @@
     return false;
   }
 
-  /**
-   * The base implementation of methods like `_.max` and `_.min` which accepts a
-   * `comparator` to determine the extremum value.
-   *
-   * @private
-   * @param {Array} array The array to iterate over.
-   * @param {Function} iteratee The iteratee invoked per iteration.
-   * @param {Function} comparator The comparator used to compare values.
-   * @returns {*} Returns the extremum value.
-   */
-  function baseExtremum(array, iteratee, comparator) {
-    var index = -1,
-        length = array.length;
-
-    while (++index < length) {
-      var value = array[index],
-          current = iteratee(value);
-
-      if (current != null && (computed === undefined
-            ? current === current
-            : comparator(current, computed)
-          )) {
-        var computed = current,
-            result = value;
-      }
-    }
-    return result;
-  }
-
   /**
    * The base implementation of methods like `_.find` and `_.findKey`, without
    * support for iteratee shorthands, which iterates over `collection` using
@@ -1017,79 +988,6 @@
     return (value && value.Object === Object) ? value : null;
   }
 
-  /**
-   * Compares values to sort them in ascending order.
-   *
-   * @private
-   * @param {*} value The value to compare.
-   * @param {*} other The other value to compare.
-   * @returns {number} Returns the sort order indicator for `value`.
-   */
-  function compareAscending(value, other) {
-    if (value !== other) {
-      var valIsNull = value === null,
-          valIsUndef = value === undefined,
-          valIsReflexive = value === value;
-
-      var othIsNull = other === null,
-          othIsUndef = other === undefined,
-          othIsReflexive = other === other;
-
-      if ((value > other && !othIsNull) || !valIsReflexive ||
-          (valIsNull && !othIsUndef && othIsReflexive) ||
-          (valIsUndef && othIsReflexive)) {
-        return 1;
-      }
-      if ((value < other && !valIsNull) || !othIsReflexive ||
-          (othIsNull && !valIsUndef && valIsReflexive) ||
-          (othIsUndef && valIsReflexive)) {
-        return -1;
-      }
-    }
-    return 0;
-  }
-
-  /**
-   * Used by `_.orderBy` to compare multiple properties of a value to another
-   * and stable sort them.
-   *
-   * If `orders` is unspecified, all values are sorted in ascending order. Otherwise,
-   * specify an order of "desc" for descending or "asc" for ascending sort order
-   * of corresponding values.
-   *
-   * @private
-   * @param {Object} object The object to compare.
-   * @param {Object} other The other object to compare.
-   * @param {boolean[]|string[]} orders The order to sort by for each property.
-   * @returns {number} Returns the sort order indicator for `object`.
-   */
-  function compareMultiple(object, other, orders) {
-    var index = -1,
-        objCriteria = object.criteria,
-        othCriteria = other.criteria,
-        length = objCriteria.length,
-        ordersLength = orders.length;
-
-    while (++index < length) {
-      var result = compareAscending(objCriteria[index], othCriteria[index]);
-      if (result) {
-        if (index >= ordersLength) {
-          return result;
-        }
-        var order = orders[index];
-        return result * (order == 'desc' ? -1 : 1);
-      }
-    }
-    // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
-    // that causes it, under certain circumstances, to provide the same value for
-    // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
-    // for more details.
-    //
-    // This also ensures a stable sort in V8 and other engines.
-    // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
-    return object.index - other.index;
-  }
-
   /**
    * Gets the number of `placeholder` occurrences in `array`.
    *
@@ -1110,29 +1008,6 @@
     return result;
   }
 
-  /**
-   * Creates a function that performs a mathematical operation on two values.
-   *
-   * @private
-   * @param {Function} operator The function to perform the operation.
-   * @returns {Function} Returns the new mathematical operation function.
-   */
-  function createMathOperation(operator) {
-    return function(value, other) {
-      var result;
-      if (value === undefined && other === undefined) {
-        return 0;
-      }
-      if (value !== undefined) {
-        result = value;
-      }
-      if (other !== undefined) {
-        result = result === undefined ? other : operator(result, other);
-      }
-      return result;
-    };
-  }
-
   /**
    * Used by `_.deburr` to convert latin-1 supplementary letters to basic latin letters.
    *
@@ -2613,6 +2488,35 @@
       return result;
     }
 
+    /**
+     * The base implementation of methods like `_.max` and `_.min` which accepts a
+     * `comparator` to determine the extremum value.
+     *
+     * @private
+     * @param {Array} array The array to iterate over.
+     * @param {Function} iteratee The iteratee invoked per iteration.
+     * @param {Function} comparator The comparator used to compare values.
+     * @returns {*} Returns the extremum value.
+     */
+    function baseExtremum(array, iteratee, comparator) {
+      var index = -1,
+          length = array.length;
+
+      while (++index < length) {
+        var value = array[index],
+            current = iteratee(value);
+
+        if (current != null && (computed === undefined
+              ? (current === current && !isSymbol(current))
+              : comparator(current, computed)
+            )) {
+          var computed = current,
+              result = value;
+        }
+      }
+      return result;
+    }
+
     /**
      * The base implementation of `_.fill` without an iteratee call guard.
      *
@@ -2795,6 +2699,19 @@
         : arrayPush(result, symbolsFunc(object));
     }
 
+    /**
+     * The base implementation of `_.gt` which doesn't coerce arguments to numbers.
+     *
+     * @private
+     * @param {*} value The value to compare.
+     * @param {*} other The other value to compare.
+     * @returns {boolean} Returns `true` if `value` is greater than `other`,
+     *  else `false`.
+     */
+    function baseGt(value, other) {
+      return value > other;
+    }
+
     /**
      * The base implementation of `_.has` without support for deep paths.
      *
@@ -3134,6 +3051,19 @@
       };
     }
 
+    /**
+     * The base implementation of `_.lt` which doesn't coerce arguments to numbers.
+     *
+     * @private
+     * @param {*} value The value to compare.
+     * @param {*} other The other value to compare.
+     * @returns {boolean} Returns `true` if `value` is less than `other`,
+     *  else `false`.
+     */
+    function baseLt(value, other) {
+      return value < other;
+    }
+
     /**
      * The base implementation of `_.map` without support for iteratee shorthands.
      *
@@ -3667,7 +3597,8 @@
           var mid = (low + high) >>> 1,
               computed = array[mid];
 
-          if ((retHighest ? (computed <= value) : (computed < value)) && computed !== null) {
+          if (computed !== null && !isSymbol(computed) &&
+              (retHighest ? (computed <= value) : (computed < value))) {
             low = mid + 1;
           } else {
             high = mid;
@@ -3698,21 +3629,26 @@
           high = array ? array.length : 0,
           valIsNaN = value !== value,
           valIsNull = value === null,
-          valIsUndef = value === undefined;
+          valIsSymbol = isSymbol(value),
+          valIsUndefined = value === undefined;
 
       while (low < high) {
         var mid = nativeFloor((low + high) / 2),
             computed = iteratee(array[mid]),
-            isDef = computed !== undefined,
-            isReflexive = computed === computed;
+            othIsDefined = computed !== undefined,
+            othIsNull = computed === null,
+            othIsReflexive = computed === computed,
+            othIsSymbol = isSymbol(computed);
 
         if (valIsNaN) {
-          var setLow = isReflexive || retHighest;
+          var setLow = retHighest || othIsReflexive;
+        } else if (valIsUndefined) {
+          setLow = othIsReflexive && (retHighest || othIsDefined);
         } else if (valIsNull) {
-          setLow = isReflexive && isDef && (retHighest || computed != null);
-        } else if (valIsUndef) {
-          setLow = isReflexive && (retHighest || isDef);
-        } else if (computed == null) {
+          setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull);
+        } else if (valIsSymbol) {
+          setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol);
+        } else if (othIsNull || othIsSymbol) {
           setLow = false;
         } else {
           setLow = retHighest ? (computed <= value) : (computed < value);
@@ -3767,6 +3703,27 @@
       return result;
     }
 
+    function baseToNumber(value) {
+      if (typeof value == 'number') {
+        return value;
+      }
+      if (isSymbol(value)) {
+        return NAN;
+      }
+      return +value;
+    }
+
+    function baseToString(value) {
+      // Exit early for strings to avoid a performance hit in some environments.
+      if (typeof value == 'string') {
+        return value;
+      }
+      if (isSymbol(value)) {
+        return symbolToString ? symbolToString.call(value) : '';
+      }
+      return (value + '');
+    }
+
     /**
      * The base implementation of `_.uniqBy` without support for iteratee shorthands.
      *
@@ -4102,6 +4059,85 @@
       return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);
     }
 
+    /**
+     * Compares values to sort them in ascending order.
+     *
+     * @private
+     * @param {*} value The value to compare.
+     * @param {*} other The other value to compare.
+     * @returns {number} Returns the sort order indicator for `value`.
+     */
+    function compareAscending(value, other) {
+      if (value !== other) {
+        var valIsNull = value === null,
+            valIsUndef = value === undefined,
+            valIsReflexive = value === value,
+            valIsSymbol = isSymbol(value);
+
+        var othIsNull = other === null,
+            othIsUndef = other === undefined,
+            othIsReflexive = other === other,
+            othIsSymbol = isSymbol(other);
+
+        if ((valIsSymbol && !othIsSymbol) ||
+            (!othIsNull && !othIsSymbol && value > other) ||
+            (valIsNull && !othIsUndef && othIsReflexive) ||
+            (valIsUndef && othIsReflexive) ||
+            !valIsReflexive) {
+          return 1;
+        }
+        if ((othIsSymbol && !valIsSymbol) ||
+            (!valIsNull && !valIsSymbol && value < other) ||
+            (othIsNull && !valIsUndef && valIsReflexive) ||
+            (othIsUndef && valIsReflexive) ||
+            !othIsReflexive) {
+          return -1;
+        }
+      }
+      return 0;
+    }
+
+    /**
+     * Used by `_.orderBy` to compare multiple properties of a value to another
+     * and stable sort them.
+     *
+     * If `orders` is unspecified, all values are sorted in ascending order. Otherwise,
+     * specify an order of "desc" for descending or "asc" for ascending sort order
+     * of corresponding values.
+     *
+     * @private
+     * @param {Object} object The object to compare.
+     * @param {Object} other The other object to compare.
+     * @param {boolean[]|string[]} orders The order to sort by for each property.
+     * @returns {number} Returns the sort order indicator for `object`.
+     */
+    function compareMultiple(object, other, orders) {
+      var index = -1,
+          objCriteria = object.criteria,
+          othCriteria = other.criteria,
+          length = objCriteria.length,
+          ordersLength = orders.length;
+
+      while (++index < length) {
+        var result = compareAscending(objCriteria[index], othCriteria[index]);
+        if (result) {
+          if (index >= ordersLength) {
+            return result;
+          }
+          var order = orders[index];
+          return result * (order == 'desc' ? -1 : 1);
+        }
+      }
+      // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
+      // that causes it, under certain circumstances, to provide the same value for
+      // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
+      // for more details.
+      //
+      // This also ensures a stable sort in V8 and other engines.
+      // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
+      return object.index - other.index;
+    }
+
     /**
      * Creates an array that is the composition of partially applied arguments,
      * placeholders, and provided arguments into a single array of arguments.
@@ -4621,6 +4657,39 @@
       };
     }
 
+    /**
+     * Creates a function that performs a mathematical operation on two values.
+     *
+     * @private
+     * @param {Function} operator The function to perform the operation.
+     * @returns {Function} Returns the new mathematical operation function.
+     */
+    function createMathOperation(operator) {
+      return function(value, other) {
+        var result;
+        if (value === undefined && other === undefined) {
+          return 0;
+        }
+        if (value !== undefined) {
+          result = value;
+        }
+        if (other !== undefined) {
+          if (result === undefined) {
+            return other;
+          }
+          if (typeof value == 'string' || typeof other == 'string') {
+            value = baseToString(value);
+            other = baseToString(other);
+          } else {
+            value = baseToNumber(value);
+            other = baseToNumber(other);
+          }
+          result = operator(value, other);
+        }
+        return result;
+      };
+    }
+
     /**
      * Creates a function like `_.over`.
      *
@@ -4727,6 +4796,23 @@
       };
     }
 
+    /**
+     * Creates a function that performs a relational operation on two values.
+     *
+     * @private
+     * @param {Function} operator The function to perform the operation.
+     * @returns {Function} Returns the new relational operation function.
+     */
+    function createRelationalOperation(operator) {
+      return function(value, other) {
+        if (!(typeof value == 'string' && typeof other == 'string')) {
+          value = toNumber(value);
+          other = toNumber(other);
+        }
+        return operator(value, other);
+      };
+    }
+
     /**
      * Creates a function that wraps `func` to continue currying.
      *
@@ -5544,7 +5630,7 @@
      */
     function isKey(value, object) {
       var type = typeof value;
-      if (type == 'number' || type == 'symbol') {
+      if (type == 'number' || type == 'boolean' || type == 'symbol' || value == null) {
         return true;
       }
       return !isArray(value) &&
@@ -5561,8 +5647,8 @@
      */
     function isKeyable(value) {
       var type = typeof value;
-      return type == 'number' || type == 'boolean' ||
-        (type == 'string' && value != '__proto__') || value == null;
+      return type == 'number' || type == 'boolean' || type == 'symbol' || value == null ||
+        (type == 'string' && value != '__proto__');
     }
 
     /**
@@ -5813,8 +5899,8 @@
      * @param {*} value The value to inspect.
      * @returns {string|symbol} Returns the key.
      */
-    function toKey(key) {
-      return (typeof key == 'string' || isSymbol(key)) ? key : (key + '');
+    function toKey(value) {
+      return (typeof value == 'string' || isSymbol(value)) ? value : (value + '');
     }
 
     /**
@@ -6839,8 +6925,13 @@
     var pullAt = rest(function(array, indexes) {
       indexes = baseFlatten(indexes, 1);
 
-      var result = baseAt(array, indexes);
-      basePullAt(array, indexes.sort(compareAscending));
+      var length = array ? array.length : 0,
+          result = baseAt(array, indexes);
+
+      basePullAt(array, arrayMap(indexes, function(index) {
+        return isIndex(index, length) ? +index : index;
+      }).sort(compareAscending));
+
       return result;
     });
 
@@ -10253,9 +10344,7 @@
      * _.gt(1, 3);
      * // => false
      */
-    function gt(value, other) {
-      return value > other;
-    }
+    var gt = createRelationalOperation(baseGt);
 
     /**
      * Checks if `value` is greater than or equal to `other`.
@@ -10279,9 +10368,9 @@
      * _.gte(1, 3);
      * // => false
      */
-    function gte(value, other) {
+    var gte = createRelationalOperation(function(value, other) {
       return value >= other;
-    }
+    });
 
     /**
      * Checks if `value` is likely an `arguments` object.
@@ -11331,9 +11420,7 @@
      * _.lt(3, 1);
      * // => false
      */
-    function lt(value, other) {
-      return value < other;
-    }
+    var lt = createRelationalOperation(baseLt);
 
     /**
      * Checks if `value` is less than or equal to `other`.
@@ -11357,9 +11444,9 @@
      * _.lte(3, 1);
      * // => false
      */
-    function lte(value, other) {
+    var lte = createRelationalOperation(function(value, other) {
       return value <= other;
-    }
+    });
 
     /**
      * Converts `value` to an array.
@@ -11497,8 +11584,9 @@
       if (typeof value == 'number') {
         return value;
       }
-      if (isSymbol(value)) {
-        return NAN;
+      var result = baseToNumber(value);
+      if (result !== result) {
+        return result;
       }
       if (isObject(value)) {
         var other = isFunction(value.valueOf) ? value.valueOf() : value;
@@ -11592,17 +11680,10 @@
      * // => '1,2,3'
      */
     function toString(value) {
-      // Exit early for strings to avoid a performance hit in some environments.
-      if (typeof value == 'string') {
-        return value;
-      }
       if (value == null) {
         return '';
       }
-      if (isSymbol(value)) {
-        return symbolToString ? symbolToString.call(value) : '';
-      }
-      var result = (value + '');
+      var result = baseToString(value);
       return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
     }
 
@@ -15195,7 +15276,7 @@
      */
     function max(array) {
       return (array && array.length)
-        ? baseExtremum(array, identity, gt)
+        ? baseExtremum(array, identity, baseGt)
         : undefined;
     }
 
@@ -15225,7 +15306,7 @@
      */
     function maxBy(array, iteratee) {
       return (array && array.length)
-        ? baseExtremum(array, getIteratee(iteratee), gt)
+        ? baseExtremum(array, getIteratee(iteratee), baseGt)
         : undefined;
     }
 
@@ -15295,7 +15376,7 @@
      */
     function min(array) {
       return (array && array.length)
-        ? baseExtremum(array, identity, lt)
+        ? baseExtremum(array, identity, baseLt)
         : undefined;
     }
 
@@ -15325,7 +15406,7 @@
      */
     function minBy(array, iteratee) {
       return (array && array.length)
-        ? baseExtremum(array, getIteratee(iteratee), lt)
+        ? baseExtremum(array, getIteratee(iteratee), baseLt)
         : undefined;
     }