diff --git a/lodash.src.js b/lodash.src.js
index ee0fa43af..d4f74bd79 100644
--- a/lodash.src.js
+++ b/lodash.src.js
@@ -2438,11 +2438,11 @@
      * @returns {boolean} Returns `true` if `object` is a match, else `false`.
      */
     function baseIsMatch(object, props, values, strictCompareFlags, customizer) {
-      var index = -1,
-          length = props.length,
+      var length = props.length,
+          index = length,
           noCustomizer = !customizer;
 
-      while (++index < length) {
+      while (index--) {
         if ((noCustomizer && strictCompareFlags[index])
               ? values[index] !== object[props[index]]
               : !(props[index] in object)
@@ -2450,22 +2450,20 @@
           return false;
         }
       }
-      index = -1;
       while (++index < length) {
         var key = props[index],
             objValue = object[key],
             srcValue = values[index];
 
         if (noCustomizer && strictCompareFlags[index]) {
-          var result = objValue !== undefined || (key in object);
-        } else {
-          result = customizer ? customizer(objValue, srcValue, key) : undefined;
-          if (result === undefined) {
-            result = baseIsEqual(srcValue, objValue, customizer, true);
+          if (objValue === undefined && !(key in object)) {
+            return false;
+          }
+        } else {
+          var result = customizer ? customizer(objValue, srcValue, key) : undefined;
+          if (!(result === undefined ? baseIsEqual(srcValue, objValue, customizer, true) : result)) {
+            return false;
           }
-        }
-        if (!result) {
-          return false;
         }
       }
       return true;
@@ -2562,7 +2560,7 @@
         }
         return object[key] === value
           ? (value !== undefined || (key in object))
-          : baseIsEqual(value, object[key], null, true);
+          : baseIsEqual(value, object[key], undefined, true);
       };
     }
 
@@ -3263,11 +3261,11 @@
           customizer = bindCallback(customizer, thisArg, 5);
           length -= 2;
         } else {
-          customizer = typeof thisArg == 'function' ? thisArg : null;
+          customizer = typeof thisArg == 'function' ? thisArg : undefined;
           length -= (customizer ? 1 : 0);
         }
         if (guard && isIterateeCall(sources[0], sources[1], guard)) {
-          customizer = length < 3 ? null : customizer;
+          customizer = length < 3 ? undefined : customizer;
           length = 1;
         }
         while (++index < length) {
@@ -3919,40 +3917,32 @@
     function equalArrays(array, other, equalFunc, customizer, isLoose, stackA, stackB) {
       var index = -1,
           arrLength = array.length,
-          othLength = other.length,
-          result = true;
+          othLength = other.length;
 
       if (arrLength != othLength && !(isLoose && othLength > arrLength)) {
         return false;
       }
-      // Deep compare the contents, ignoring non-numeric properties.
-      while (result && ++index < arrLength) {
+      // Ignore non-index properties.
+      while (++index < arrLength) {
         var arrValue = array[index],
-            othValue = other[index];
+            othValue = other[index],
+            result = customizer ? customizer(isLoose ? othValue : arrValue, isLoose ? arrValue : othValue, index) : undefined;
 
-        result = undefined;
-        if (customizer) {
-          result = isLoose
-            ? customizer(othValue, arrValue, index)
-            : customizer(arrValue, othValue, index);
+        if (result !== undefined && !result) {
+          return false;
         }
-        if (result === undefined) {
-          // Recursively compare arrays (susceptible to call stack limits).
-          if (isLoose) {
-            var othIndex = othLength;
-            while (othIndex--) {
-              othValue = other[othIndex];
-              result = (arrValue && arrValue === othValue) || equalFunc(arrValue, othValue, customizer, isLoose, stackA, stackB);
-              if (result) {
-                break;
-              }
-            }
-          } else {
-            result = (arrValue && arrValue === othValue) || equalFunc(arrValue, othValue, customizer, isLoose, stackA, stackB);
+        // Recursively compare arrays (susceptible to call stack limits).
+        if (isLoose) {
+          if (!arraySome(other, function(othValue) {
+                return arrValue === othValue || equalFunc(arrValue, othValue, customizer, isLoose, stackA, stackB);
+              })) {
+            return false;
           }
+        } else if (!(arrValue === othValue || equalFunc(arrValue, othValue, customizer, isLoose, stackA, stackB))) {
+          return false;
         }
       }
-      return !!result;
+      return true;
     }
 
     /**
@@ -8567,7 +8557,7 @@
         customizer = isDeep;
         isDeep = false;
       }
-      customizer = typeof customizer == 'function' && bindCallback(customizer, thisArg, 1);
+      customizer = typeof customizer == 'function' ? bindCallback(customizer, thisArg, 1) : undefined;
       return baseClone(value, isDeep, customizer);
     }
 
@@ -8617,7 +8607,7 @@
      * // => 20
      */
     function cloneDeep(value, customizer, thisArg) {
-      customizer = typeof customizer == 'function' && bindCallback(customizer, thisArg, 1);
+      customizer = typeof customizer == 'function' ? bindCallback(customizer, thisArg, 1) : undefined;
       return baseClone(value, true, customizer);
     }
 
@@ -8817,7 +8807,7 @@
      * // => true
      */
     function isEqual(value, other, customizer, thisArg) {
-      customizer = typeof customizer == 'function' && bindCallback(customizer, thisArg, 3);
+      customizer = typeof customizer == 'function' ? bindCallback(customizer, thisArg, 3) : undefined;
       if (!customizer && isStrictComparable(value) && isStrictComparable(other)) {
         return value === other;
       }
@@ -8976,7 +8966,7 @@
       if (object == null) {
         return false;
       }
-      customizer = typeof customizer == 'function' && bindCallback(customizer, thisArg, 3);
+      customizer = typeof customizer == 'function' ? bindCallback(customizer, thisArg, 3) : undefined;
       object = toObject(object);
       if (!customizer && length == 1) {
         var key = props[0],