diff --git a/lodash.src.js b/lodash.src.js
index 0cd26add2..aee248326 100644
--- a/lodash.src.js
+++ b/lodash.src.js
@@ -314,14 +314,14 @@
    * @private
    * @param {Array} array The array to search.
    * @param {*} value The value to search for.
-   * @param {number} [fromIndex=0] The index to search from.
+   * @param {number} fromIndex The index to search from.
    * @returns {number} Returns the index of the matched value, else `-1`.
    */
   function baseIndexOf(array, value, fromIndex) {
     if (value !== value) {
       return indexOfNaN(array, fromIndex);
     }
-    var index = fromIndex == null ? -1 : (fromIndex - 1),
+    var index = fromIndex - 1,
         length = array.length;
 
     while (++index < length) {
@@ -509,13 +509,13 @@
    *
    * @private
    * @param {Array} array The array to search.
-   * @param {number} [fromIndex] The index to search from.
+   * @param {number} fromIndex The index to search from.
    * @param {boolean} [fromRight] Specify iterating from right to left.
    * @returns {number} Returns the index of the matched `NaN`, else `-1`.
    */
   function indexOfNaN(array, fromIndex, fromRight) {
     var length = array.length,
-        index = fromIndex == null ? (fromRight ? length : -1) : (fromIndex + (fromRight ? 0 : -1));
+        index = fromIndex + (fromRight ? 0 : -1);
 
     while ((fromRight ? index-- : ++index < length)) {
       var other = array[index];
@@ -1991,7 +1991,7 @@
           }
           result.push(value);
         }
-        else if (indexOf(values, value) < 0) {
+        else if (indexOf(values, value, 0) < 0) {
           result.push(value);
         }
       }
@@ -2817,7 +2817,7 @@
           }
           result.push(value);
         }
-        else if (indexOf(seen, computed) < 0) {
+        else if (indexOf(seen, computed, 0) < 0) {
           if (iteratee || isLarge) {
             seen.push(computed);
           }
@@ -4725,14 +4725,14 @@
         return -1;
       }
       if (typeof fromIndex == 'number') {
-        fromIndex = fromIndex < 0 ? nativeMax(length + fromIndex, 0) : (fromIndex || 0);
+        fromIndex = fromIndex < 0 ? nativeMax(length + fromIndex, 0) : fromIndex;
       } else if (fromIndex) {
         var index = binaryIndex(array, value),
             other = array[index];
 
         return (value === value ? value === other : other !== other) ? index : -1;
       }
-      return baseIndexOf(array, value, fromIndex);
+      return baseIndexOf(array, value, fromIndex || 0);
     }
 
     /**
@@ -4795,11 +4795,11 @@
       outer:
       while (++index < length) {
         value = array[index];
-        if ((seen ? cacheIndexOf(seen, value) : indexOf(result, value)) < 0) {
+        if ((seen ? cacheIndexOf(seen, value) : indexOf(result, value, 0)) < 0) {
           argsIndex = argsLength;
           while (--argsIndex) {
             var cache = caches[argsIndex];
-            if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value)) < 0) {
+            if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value, 0)) < 0) {
               continue outer;
             }
           }