diff --git a/dist/lodash.compat.js b/dist/lodash.compat.js
index 78f32fb25..ff19d404c 100644
--- a/dist/lodash.compat.js
+++ b/dist/lodash.compat.js
@@ -1111,18 +1111,19 @@
 
       while (++index < length) {
         var value = array[index];
+
         // recursively flatten arrays (susceptible to call stack limits)
         if (value && typeof value == 'object' && (isArray(value) || isArguments(value))) {
           if (!isShallow) {
             value = baseFlatten(value, isShallow, isArgArrays);
           }
-          var pad = result.length,
-              valIndex = -1,
-              valLength = value.length;
+          var valIndex = -1,
+              valLength = value.length,
+              resIndex = result.length;
 
           result.length += valLength;
           while (++valIndex < valLength) {
-            result[pad + valIndex] = value[valIndex];
+            result[resIndex++] = value[valIndex];
           }
         } else if (!isArgArrays) {
           result.push(value);
diff --git a/dist/lodash.compat.min.js b/dist/lodash.compat.min.js
index a2256cc58..e4a7bd6eb 100644
--- a/dist/lodash.compat.min.js
+++ b/dist/lodash.compat.min.js
@@ -4,53 +4,53 @@
  * Build: `lodash -o ./dist/lodash.compat.js`
  */
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diff --git a/dist/lodash.js b/dist/lodash.js
index 4b38d5de1..d1c81dfbe 100644
--- a/dist/lodash.js
+++ b/dist/lodash.js
@@ -842,18 +842,19 @@
 
       while (++index < length) {
         var value = array[index];
+
         // recursively flatten arrays (susceptible to call stack limits)
         if (value && typeof value == 'object' && (isArray(value) || isArguments(value))) {
           if (!isShallow) {
             value = baseFlatten(value, isShallow, isArgArrays);
           }
-          var pad = result.length,
-              valIndex = -1,
-              valLength = value.length;
+          var valIndex = -1,
+              valLength = value.length,
+              resIndex = result.length;
 
           result.length += valLength;
           while (++valIndex < valLength) {
-            result[pad + valIndex] = value[valIndex];
+            result[resIndex++] = value[valIndex];
           }
         } else if (!isArgArrays) {
           result.push(value);
diff --git a/dist/lodash.min.js b/dist/lodash.min.js
index 299f6a238..3536055c4 100644
--- a/dist/lodash.min.js
+++ b/dist/lodash.min.js
@@ -10,7 +10,7 @@ for(var r=-1,u=M[typeof n]&&qe(n),o=u?u.length:0;++r<o&&(e=u[r],false!==t(n[e],e
 if(!u)return o;var a=arguments,i=0,f=typeof e=="number"?2:a.length;if(3<f&&"function"==typeof a[f-2])var l=nt(a[--f-1],a[f--],2);else 2<f&&"function"==typeof a[f-1]&&(l=a[--f]);for(;++i<f;)if((u=a[i])&&M[typeof u])for(var c=-1,p=M[typeof u]&&qe(u),s=p?p.length:0;++c<s;)r=p[c],o[r]=l?l(o[r],u[r]):u[r];return o}function J(n){var t,e=[];if(!n||!M[typeof n])return e;for(t in n)ve.call(n,t)&&e.push(t);return e}function X(n){return n&&typeof n=="object"&&!ze(n)&&ve.call(n,"__wrapped__")?n:new Y(n)}function Y(n,t){this.__chain__=!!t,this.__wrapped__=n
 }function Z(n,t,e,r,u){var o=n;if(e){if(o=e(o),typeof o!="undefined")return o;o=n}var a=yt(o);if(a){var f=be.call(o);if(!L[f])return o;var l=ze(o)}if(!a||!t)return a?l?s(o):G({},o):o;switch(a=De[f],f){case F:case T:return new a(+o);case q:case K:return new a(o);case P:return a(o.source,O.exec(o))}f=!r,r||(r=i()),u||(u=i());for(var p=r.length;p--;)if(r[p]==n)return u[p];return o=l?a(o.length):{},l&&(ve.call(n,"index")&&(o.index=n.index),ve.call(n,"input")&&(o.input=n.input)),r.push(n),u.push(o),(l?xt:y)(n,function(n,a){o[a]=Z(n,t,e,r,u)
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-}}return Pt(n,t)}function tt(n,t,e,r){r=(r||0)-1;for(var u=n?n.length:0,o=[];++r<u;){var a=n[r];if(a&&typeof a=="object"&&(ze(a)||pt(a))){t||(a=tt(a,t,e));var i=o.length,f=-1,l=a.length;for(o.length+=l;++f<l;)o[i+f]=a[f]}else e||o.push(a)}return o}function et(n,t,e,r,u,o){if(e){var a=e(n,t);if(typeof a!="undefined")return!!a}if(n===t)return 0!==n||1/n==1/t;if(n===n&&!(n&&M[typeof n]||t&&M[typeof t]))return!1;if(null==n||null==t)return n===t;var f=be.call(n),l=be.call(t);if(f==$&&(f=W),l==$&&(l=W),f!=l)return!1;
+}}return Pt(n,t)}function tt(n,t,e,r){r=(r||0)-1;for(var u=n?n.length:0,o=[];++r<u;){var a=n[r];if(a&&typeof a=="object"&&(ze(a)||pt(a))){t||(a=tt(a,t,e));var i=-1,f=a.length,l=o.length;for(o.length+=f;++i<f;)o[l++]=a[i]}else e||o.push(a)}return o}function et(n,t,e,r,u,o){if(e){var a=e(n,t);if(typeof a!="undefined")return!!a}if(n===t)return 0!==n||1/n==1/t;if(n===n&&!(n&&M[typeof n]||t&&M[typeof t]))return!1;if(null==n||null==t)return n===t;var f=be.call(n),l=be.call(t);if(f==$&&(f=W),l==$&&(l=W),f!=l)return!1;
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diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index 26df49a6a..61f9320ab 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -418,18 +418,19 @@
 
     while (++index < length) {
       var value = array[index];
+
       // recursively flatten arrays (susceptible to call stack limits)
       if (value && typeof value == 'object' && (isArray(value) || isArguments(value))) {
         if (!isShallow) {
           value = baseFlatten(value, isShallow, isArgArrays);
         }
-        var pad = result.length,
-            valIndex = -1,
-            valLength = value.length;
+        var valIndex = -1,
+            valLength = value.length,
+            resIndex = result.length;
 
         result.length += valLength;
         while (++valIndex < valLength) {
-          result[pad + valIndex] = value[valIndex];
+          result[resIndex++] = value[valIndex];
         }
       } else if (!isArgArrays) {
         result.push(value);
diff --git a/dist/lodash.underscore.min.js b/dist/lodash.underscore.min.js
index 10331097b..ac42fdfa1 100644
--- a/dist/lodash.underscore.min.js
+++ b/dist/lodash.underscore.min.js
@@ -4,7 +4,7 @@
  * Build: `lodash underscore exports="amd,commonjs,global,node" -o ./dist/lodash.underscore.js`
  */
 ;(function(){function n(n,r,t){t=(t||0)-1;for(var e=n?n.length:0;++t<e;)if(n[t]===r)return t;return-1}function r(n,r){var t=n.l,e=r.l;if(t!==e){if(t>e||typeof t=="undefined")return 1;if(t<e||typeof e=="undefined")return-1}return n.m-r.m}function t(n){return"\\"+vr[n]}function e(){}function u(n){return n instanceof u?n:new o(n)}function o(n,r){this.__chain__=!!r,this.__wrapped__=n}function i(n,r,t){if(typeof n!="function")return Q;if(typeof r=="undefined")return n;switch(t){case 1:return function(t){return n.call(r,t)
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+};case 2:return function(t,e){return n.call(r,t,e)};case 3:return function(t,e,u){return n.call(r,t,e,u)};case 4:return function(t,e,u,o){return n.call(r,t,e,u,o)}}return J(n,r)}function f(n,r,t,e){e=(e||0)-1;for(var u=n?n.length:0,o=[];++e<u;){var i=n[e];if(i&&typeof i=="object"&&(Pr(i)||y(i))){r||(i=f(i,r,t));var a=-1,l=i.length,c=o.length;for(o.length+=l;++a<l;)o[c++]=i[a]}else t||o.push(i)}return o}function a(n,r,t,e){if(n===r)return 0!==n||1/n==1/r;if(n===n&&!(n&&hr[typeof n]||r&&hr[typeof r]))return!1;
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diff --git a/lodash.js b/lodash.js
index a4ac4cf92..e424d1b7b 100644
--- a/lodash.js
+++ b/lodash.js
@@ -1130,18 +1130,19 @@
 
       while (++index < length) {
         var value = array[index];
+
         // recursively flatten arrays (susceptible to call stack limits)
         if (value && typeof value == 'object' && (isArray(value) || isArguments(value))) {
           if (!isShallow) {
             value = baseFlatten(value, isShallow, isArgArrays);
           }
-          var pad = result.length,
-              valIndex = -1,
-              valLength = value.length;
+          var valIndex = -1,
+              valLength = value.length,
+              resIndex = result.length;
 
           result.length += valLength;
           while (++valIndex < valLength) {
-            result[pad + valIndex] = value[valIndex];
+            result[resIndex++] = value[valIndex];
           }
         } else if (!isArgArrays) {
           result.push(value);