diff --git a/dist/nestedObjectAssign.web.js b/dist/nestedObjectAssign.web.js
index 3a2cbf5..00cfe2f 100644
--- a/dist/nestedObjectAssign.web.js
+++ b/dist/nestedObjectAssign.web.js
@@ -1 +1 @@
-!function(e,t){"object"==typeof exports&&"object"==typeof module?module.exports=t():"function"==typeof define&&define.amd?define("nestedObjectAssign",[],t):"object"==typeof exports?exports.nestedObjectAssign=t():e.nestedObjectAssign=t()}(this,function(){return function(e){function t(n){if(r[n])return r[n].exports;var o=r[n]={exports:{},id:n,loaded:!1};return e[n].call(o.exports,o,o.exports,t),o.loaded=!0,o.exports}var r={};return t.m=e,t.c=r,t.p="",t(0)}([function(e,t,r){"use strict";function n(e,t,r){return t in e?Object.defineProperty(e,t,{value:r,enumerable:!0,configurable:!0,writable:!0}):e[t]=r,e}function o(e){for(var t=arguments.length,r=Array(t>1?t-1:0),c=1;c<t;c++)r[c-1]=arguments[c];if(!r.length)return e;var u=r.shift();if((0,i.isObject)(e)&&(0,i.isObject)(u))for(var f in u)(0,i.isObject)(u[f])?(e[f]||Object.assign(e,n({},f,{})),o(e[f],u[f])):(0,s.isArray)(u[f])?(e[f]||Object.assign(e,n({},f,[])),e[f]=e[f].concat(u[f])):Object.assign(e,n({},f,u[f]));return o.apply(void 0,[e].concat(r))}Object.defineProperty(t,"__esModule",{value:!0}),t.default=o;var i=r(1),s=r(2);e.exports=t.default},function(e,t){"use strict";function r(e){return e&&"object"===("undefined"==typeof e?"undefined":n(e))&&!Array.isArray(e)}Object.defineProperty(t,"__esModule",{value:!0});var n="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e};t.isObject=r},function(e,t){"use strict";function r(e){return e&&Array.isArray(e)}Object.defineProperty(t,"__esModule",{value:!0}),t.isArray=r}])});
\ No newline at end of file
+!function(e,t){"object"==typeof exports&&"object"==typeof module?module.exports=t():"function"==typeof define&&define.amd?define("nestedObjectAssign",[],t):"object"==typeof exports?exports.nestedObjectAssign=t():e.nestedObjectAssign=t()}(this,function(){return function(e){function t(n){if(r[n])return r[n].exports;var o=r[n]={exports:{},id:n,loaded:!1};return e[n].call(o.exports,o,o.exports,t),o.loaded=!0,o.exports}var r={};return t.m=e,t.c=r,t.p="",t(0)}([function(e,t,r){"use strict";function n(e,t,r){return t in e?Object.defineProperty(e,t,{value:r,enumerable:!0,configurable:!0,writable:!0}):e[t]=r,e}function o(e){for(var t=arguments.length,r=Array(t>1?t-1:0),u=1;u<t;u++)r[u-1]=arguments[u];if(!r.length)return e;var f=r.shift();if((0,c.isObject)(e)&&(0,c.isObject)(f))for(var a in f)(0,c.isObject)(f[a])&&!i(a)?(e[a]||Object.assign(e,n({},a,{})),o(e[a],f[a])):(0,s.isArray)(f[a])?(e[a]||Object.assign(e,n({},a,[])),e[a]=e[a].concat(f[a])):Object.assign(e,n({},a,f[a]));return o.apply(void 0,[e].concat(r))}function i(e){return/__proto__|constructor|prototype/.test(e)}Object.defineProperty(t,"__esModule",{value:!0}),t.default=o;var c=r(1),s=r(2);e.exports=t.default},function(e,t){"use strict";function r(e){return e&&"object"===("undefined"==typeof e?"undefined":n(e))&&!Array.isArray(e)}Object.defineProperty(t,"__esModule",{value:!0});var n="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e};t.isObject=r},function(e,t){"use strict";function r(e){return e&&Array.isArray(e)}Object.defineProperty(t,"__esModule",{value:!0}),t.isArray=r}])});
\ No newline at end of file
diff --git a/lib/nestedObjectAssign.js b/lib/nestedObjectAssign.js
index 8f932ec..ec6c316 100644
--- a/lib/nestedObjectAssign.js
+++ b/lib/nestedObjectAssign.js
@@ -1 +1 @@
-module.exports=function(e){function t(n){if(r[n])return r[n].exports;var o=r[n]={exports:{},id:n,loaded:!1};return e[n].call(o.exports,o,o.exports,t),o.loaded=!0,o.exports}var r={};return t.m=e,t.c=r,t.p="",t(0)}([function(e,t,r){"use strict";function n(e,t,r){return t in e?Object.defineProperty(e,t,{value:r,enumerable:!0,configurable:!0,writable:!0}):e[t]=r,e}function o(e){for(var t=arguments.length,r=Array(t>1?t-1:0),c=1;c<t;c++)r[c-1]=arguments[c];if(!r.length)return e;var f=r.shift();if((0,i.isObject)(e)&&(0,i.isObject)(f))for(var s in f)(0,i.isObject)(f[s])?(e[s]||Object.assign(e,n({},s,{})),o(e[s],f[s])):(0,u.isArray)(f[s])?(e[s]||Object.assign(e,n({},s,[])),e[s]=e[s].concat(f[s])):Object.assign(e,n({},s,f[s]));return o.apply(void 0,[e].concat(r))}Object.defineProperty(t,"__esModule",{value:!0}),t.default=o;var i=r(1),u=r(2);e.exports=t.default},function(e,t){"use strict";function r(e){return e&&"object"===("undefined"==typeof e?"undefined":n(e))&&!Array.isArray(e)}Object.defineProperty(t,"__esModule",{value:!0});var n="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e};t.isObject=r},function(e,t){"use strict";function r(e){return e&&Array.isArray(e)}Object.defineProperty(t,"__esModule",{value:!0}),t.isArray=r}]);
\ No newline at end of file
+module.exports=function(e){function t(o){if(r[o])return r[o].exports;var n=r[o]={exports:{},id:o,loaded:!1};return e[o].call(n.exports,n,n.exports,t),n.loaded=!0,n.exports}var r={};return t.m=e,t.c=r,t.p="",t(0)}([function(e,t,r){"use strict";function o(e,t,r){return t in e?Object.defineProperty(e,t,{value:r,enumerable:!0,configurable:!0,writable:!0}):e[t]=r,e}function n(e){for(var t=arguments.length,r=Array(t>1?t-1:0),s=1;s<t;s++)r[s-1]=arguments[s];if(!r.length)return e;var f=r.shift();if((0,u.isObject)(e)&&(0,u.isObject)(f))for(var a in f)(0,u.isObject)(f[a])&&!i(a)?(e[a]||Object.assign(e,o({},a,{})),n(e[a],f[a])):(0,c.isArray)(f[a])?(e[a]||Object.assign(e,o({},a,[])),e[a]=e[a].concat(f[a])):Object.assign(e,o({},a,f[a]));return n.apply(void 0,[e].concat(r))}function i(e){return/__proto__|constructor|prototype/.test(e)}Object.defineProperty(t,"__esModule",{value:!0}),t.default=n;var u=r(1),c=r(2);e.exports=t.default},function(e,t){"use strict";function r(e){return e&&"object"===("undefined"==typeof e?"undefined":o(e))&&!Array.isArray(e)}Object.defineProperty(t,"__esModule",{value:!0});var o="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e};t.isObject=r},function(e,t){"use strict";function r(e){return e&&Array.isArray(e)}Object.defineProperty(t,"__esModule",{value:!0}),t.isArray=r}]);
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 662676a..9e71978 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "nested-object-assign",
-  "version": "1.0.3",
+  "version": "1.0.4",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -22,9 +22,9 @@
       "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
       "dev": true,
       "requires": {
-        "kind-of": "3.2.2",
-        "longest": "1.0.1",
-        "repeat-string": "1.6.1"
+        "kind-of": "^3.0.2",
+        "longest": "^1.0.1",
+        "repeat-string": "^1.5.2"
       }
     },
     "amdefine": {
@@ -39,7 +39,7 @@
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       "dev": true,
       "requires": {
-        "ansi-wrap": "0.1.0"
+        "ansi-wrap": "^0.1.0"
       }
     },
     "ansi-escapes": {
@@ -81,8 +81,8 @@
       "integrity": "sha512-0XNayC8lTHQ2OI8aljNCN3sSx6hsr/1+rlcDAotXJR7C1oZZHCNsfpbKwMjRA3Uqb5tF1Rae2oloTr4xpq+WjA==",
       "dev": true,
       "requires": {
-        "micromatch": "2.3.11",
-        "normalize-path": "2.1.1"
+        "micromatch": "^2.1.5",
+        "normalize-path": "^2.0.0"
       },
       "dependencies": {
         "arr-diff": {
@@ -91,7 +91,7 @@
           "integrity": "sha1-jzuCf5Vai9ZpaX5KQlasPOrjVs8=",
           "dev": true,
           "requires": {
-            "arr-flatten": "1.1.0"
+            "arr-flatten": "^1.0.1"
           }
         },
         "array-unique": {
@@ -106,9 +106,9 @@
           "integrity": "sha1-uneWLhLf+WnWt2cR6RS3N4V79qc=",
           "dev": true,
           "requires": {
-            "expand-range": "1.8.2",
-            "preserve": "0.2.0",
-            "repeat-element": "1.1.3"
+            "expand-range": "^1.8.1",
+            "preserve": "^0.2.0",
+            "repeat-element": "^1.1.2"
           }
         },
         "expand-brackets": {
@@ -117,7 +117,7 @@
           "integrity": "sha1-3wcoTjQqgHzXM6xa9yQR5YHRF3s=",
           "dev": true,
           "requires": {
-            "is-posix-bracket": "0.1.1"
+            "is-posix-bracket": "^0.1.0"
           }
         },
         "extglob": {
@@ -126,7 +126,7 @@
           "integrity": "sha1-Lhj/PS9JqydlzskCPwEdqo2DSaE=",
           "dev": true,
           "requires": {
-            "is-extglob": "1.0.0"
+            "is-extglob": "^1.0.0"
           }
         },
         "is-extglob": {
@@ -141,7 +141,7 @@
           "integrity": "sha1-0Jb5JqPe1WAPP9/ZEZjLCIjC2GM=",
           "dev": true,
           "requires": {
-            "is-extglob": "1.0.0"
+            "is-extglob": "^1.0.0"
           }
         },
         "micromatch": {
@@ -150,19 +150,19 @@
           "integrity": "sha1-hmd8l9FyCzY0MdBNDRUpO9OMFWU=",
           "dev": true,
           "requires": {
-            "arr-diff": "2.0.0",
-            "array-unique": "0.2.1",
-            "braces": "1.8.5",
-            "expand-brackets": "0.1.5",
-            "extglob": "0.3.2",
-            "filename-regex": "2.0.1",
-            "is-extglob": "1.0.0",
-            "is-glob": "2.0.1",
-            "kind-of": "3.2.2",
-            "normalize-path": "2.1.1",
-            "object.omit": "2.0.1",
-            "parse-glob": "3.0.4",
-            "regex-cache": "0.4.4"
+            "arr-diff": "^2.0.0",
+            "array-unique": "^0.2.1",
+            "braces": "^1.8.2",
+            "expand-brackets": "^0.1.4",
+            "extglob": "^0.3.1",
+            "filename-regex": "^2.0.0",
+            "is-extglob": "^1.0.0",
+            "is-glob": "^2.0.1",
+            "kind-of": "^3.0.2",
+            "normalize-path": "^2.0.1",
+            "object.omit": "^2.0.0",
+            "parse-glob": "^3.0.4",
+            "regex-cache": "^0.4.2"
           }
         }
       }
@@ -179,7 +179,7 @@
       "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
       "dev": true,
       "requires": {
-        "sprintf-js": "1.0.3"
+        "sprintf-js": "~1.0.2"
       }
     },
     "arr-diff": {
@@ -224,7 +224,7 @@
       "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
       "dev": true,
       "requires": {
-        "array-uniq": "1.0.3"
+        "array-uniq": "^1.0.1"
       }
     },
     "array-uniq": {
@@ -313,9 +313,9 @@
       "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
       "dev": true,
       "requires": {
-        "chalk": "1.1.3",
-        "esutils": "2.0.2",
-        "js-tokens": "3.0.2"
+        "chalk": "^1.1.3",
+        "esutils": "^2.0.2",
+        "js-tokens": "^3.0.2"
       }
     },
     "babel-core": {
@@ -324,25 +324,25 @@
       "integrity": "sha512-6jyFLuDmeidKmUEb3NM+/yawG0M2bDZ9Z1qbZP59cyHLz8kYGKYwpJP0UwUKKUiTRNvxfLesJnTedqczP7cTDA==",
       "dev": true,
       "requires": {
-        "babel-code-frame": "6.26.0",
-        "babel-generator": "6.26.1",
-        "babel-helpers": "6.24.1",
-        "babel-messages": "6.23.0",
-        "babel-register": "6.26.0",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0",
-        "babylon": "6.18.0",
-        "convert-source-map": "1.5.1",
-        "debug": "2.6.9",
-        "json5": "0.5.1",
-        "lodash": "4.17.10",
-        "minimatch": "3.0.4",
-        "path-is-absolute": "1.0.1",
-        "private": "0.1.8",
-        "slash": "1.0.0",
-        "source-map": "0.5.7"
+        "babel-code-frame": "^6.26.0",
+        "babel-generator": "^6.26.0",
+        "babel-helpers": "^6.24.1",
+        "babel-messages": "^6.23.0",
+        "babel-register": "^6.26.0",
+        "babel-runtime": "^6.26.0",
+        "babel-template": "^6.26.0",
+        "babel-traverse": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "babylon": "^6.18.0",
+        "convert-source-map": "^1.5.1",
+        "debug": "^2.6.9",
+        "json5": "^0.5.1",
+        "lodash": "^4.17.4",
+        "minimatch": "^3.0.4",
+        "path-is-absolute": "^1.0.1",
+        "private": "^0.1.8",
+        "slash": "^1.0.0",
+        "source-map": "^0.5.7"
       }
     },
     "babel-eslint": {
@@ -351,12 +351,12 @@
       "integrity": "sha1-prpRrlgqHU4lrf3bwqYfjVqQQLk=",
       "dev": true,
       "requires": {
-        "acorn-to-esprima": "2.0.8",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0",
-        "babylon": "6.18.0",
-        "lodash.assign": "3.2.0",
-        "lodash.pick": "3.1.0"
+        "acorn-to-esprima": "^2.0.4",
+        "babel-traverse": "^6.0.20",
+        "babel-types": "^6.0.19",
+        "babylon": "^6.0.18",
+        "lodash.assign": "^3.2.0",
+        "lodash.pick": "^3.1.0"
       }
     },
     "babel-generator": {
@@ -365,14 +365,14 @@
       "integrity": "sha512-HyfwY6ApZj7BYTcJURpM5tznulaBvyio7/0d4zFOeMPUmfxkCjHocCuoLa2SAGzBI8AREcH3eP3758F672DppA==",
       "dev": true,
       "requires": {
-        "babel-messages": "6.23.0",
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0",
-        "detect-indent": "4.0.0",
-        "jsesc": "1.3.0",
-        "lodash": "4.17.10",
-        "source-map": "0.5.7",
-        "trim-right": "1.0.1"
+        "babel-messages": "^6.23.0",
+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "detect-indent": "^4.0.0",
+        "jsesc": "^1.3.0",
+        "lodash": "^4.17.4",
+        "source-map": "^0.5.7",
+        "trim-right": "^1.0.1"
       }
     },
     "babel-helper-call-delegate": {
@@ -381,10 +381,10 @@
       "integrity": "sha1-7Oaqzdx25Bw0YfiL/Fdb0Nqi340=",
       "dev": true,
       "requires": {
-        "babel-helper-hoist-variables": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-hoist-variables": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-define-map": {
@@ -393,10 +393,10 @@
       "integrity": "sha1-pfVtq0GiX5fstJjH66ypgZ+Vvl8=",
       "dev": true,
       "requires": {
-        "babel-helper-function-name": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0",
-        "lodash": "4.17.10"
+        "babel-helper-function-name": "^6.24.1",
+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "lodash": "^4.17.4"
       }
     },
     "babel-helper-function-name": {
@@ -405,11 +405,11 @@
       "integrity": "sha1-00dbjAPtmCQqJbSDUasYOZ01gKk=",
       "dev": true,
       "requires": {
-        "babel-helper-get-function-arity": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-get-function-arity": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-get-function-arity": {
@@ -418,8 +418,8 @@
       "integrity": "sha1-j3eCqpNAfEHTqlCQj4mwMbG2hT0=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-hoist-variables": {
@@ -428,8 +428,8 @@
       "integrity": "sha1-HssnaJydJVE+rbyZFKc/VAi+enY=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-optimise-call-expression": {
@@ -438,8 +438,8 @@
       "integrity": "sha1-96E0J7qfc/j0+pk8VKl4gtEkQlc=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-regex": {
@@ -448,9 +448,9 @@
       "integrity": "sha1-MlxZ+QL4LyS3T6zu0DY5VPZJXnI=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0",
-        "lodash": "4.17.10"
+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "lodash": "^4.17.4"
       }
     },
     "babel-helper-replace-supers": {
@@ -459,12 +459,12 @@
       "integrity": "sha1-v22/5Dk40XNpohPKiov3S2qQqxo=",
       "dev": true,
       "requires": {
-        "babel-helper-optimise-call-expression": "6.24.1",
-        "babel-messages": "6.23.0",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-optimise-call-expression": "^6.24.1",
+        "babel-messages": "^6.23.0",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helpers": {
@@ -473,8 +473,8 @@
       "integrity": "sha1-NHHenK7DiOXIUOWX5Yom3fN2ArI=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1"
       }
     },
     "babel-loader": {
@@ -483,10 +483,10 @@
       "integrity": "sha1-CzQRLVsHSKjc2/Uaz2+b1C1QuMo=",
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-        "inquirer": "0.11.4",
-        "is-my-json-valid": "2.19.0",
-        "is-resolvable": "1.1.0",
+        "chalk": "^1.0.0",
+        "concat-stream": "^1.4.6",
+        "debug": "^2.1.1",
+        "doctrine": "^0.7.1",
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+        "escope": "^3.3.0",
+        "espree": "^2.2.4",
+        "estraverse": "^4.1.1",
+        "estraverse-fb": "^1.3.1",
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+        "glob": "^5.0.14",
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+        "handlebars": "^4.0.0",
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-        "text-table": "0.2.0",
-        "user-home": "2.0.0",
-        "xml-escape": "1.0.0"
+        "json-stable-stringify": "^1.0.0",
+        "lodash.clonedeep": "^3.0.1",
+        "lodash.merge": "^3.3.2",
+        "lodash.omit": "^3.1.0",
+        "minimatch": "^3.0.0",
+        "mkdirp": "^0.5.0",
+        "object-assign": "^4.0.1",
+        "optionator": "^0.6.0",
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+        "path-is-inside": "^1.0.1",
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@@ -1756,11 +1756,11 @@
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-            "once": "1.4.0",
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+            "inflight": "^1.0.4",
+            "inherits": "2",
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-        "object-hash": "1.3.0",
-        "rimraf": "2.6.2"
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+        "object-hash": "^1.1.4",
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@@ -1796,9 +1796,9 @@
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-            "big.js": "3.2.0",
-            "emojis-list": "2.1.0",
-            "json5": "0.5.1"
+            "big.js": "^3.1.3",
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@@ -1827,7 +1827,7 @@
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-        "estraverse": "4.2.0"
+        "estraverse": "^4.1.0"
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@@ -1854,8 +1854,8 @@
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-        "d": "1.0.0",
-        "es5-ext": "0.10.46"
+        "d": "1",
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@@ -1876,13 +1876,13 @@
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-        "regex-not": "1.0.2",
-        "snapdragon": "0.8.2",
-        "to-regex": "3.0.2"
+        "debug": "^2.3.3",
+        "define-property": "^0.2.5",
+        "extend-shallow": "^2.0.1",
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@@ -1891,7 +1891,7 @@
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           "dev": true,
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@@ -1900,7 +1900,7 @@
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           "dev": true,
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@@ -1911,7 +1911,7 @@
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@@ -1920,11 +1920,11 @@
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-            "repeat-element": "1.1.3",
-            "repeat-string": "1.6.1"
+            "is-number": "^2.1.0",
+            "isobject": "^2.0.0",
+            "randomatic": "^3.0.0",
+            "repeat-element": "^1.1.2",
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@@ -1933,7 +1933,7 @@
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           "dev": true,
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-            "kind-of": "3.2.2"
+            "kind-of": "^3.0.2"
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@@ -1953,7 +1953,7 @@
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       "dev": true,
       "requires": {
-        "homedir-polyfill": "1.0.1"
+        "homedir-polyfill": "^1.0.1"
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@@ -1968,8 +1968,8 @@
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       "dev": true,
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-        "assign-symbols": "1.0.0",
-        "is-extendable": "1.0.1"
+        "assign-symbols": "^1.0.0",
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+            "is-plain-object": "^2.0.4"
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@@ -1989,14 +1989,14 @@
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-        "regex-not": "1.0.2",
-        "snapdragon": "0.8.2",
-        "to-regex": "3.0.2"
+        "array-unique": "^0.3.2",
+        "define-property": "^1.0.0",
+        "expand-brackets": "^2.1.4",
+        "extend-shallow": "^2.0.1",
+        "fragment-cache": "^0.2.1",
+        "regex-not": "^1.0.0",
+        "snapdragon": "^0.8.1",
+        "to-regex": "^3.0.1"
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@@ -2005,7 +2005,7 @@
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           "dev": true,
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-            "is-descriptor": "1.0.2"
+            "is-descriptor": "^1.0.0"
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@@ -2014,7 +2014,7 @@
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           "dev": true,
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-            "is-extendable": "0.1.1"
+            "is-extendable": "^0.1.0"
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@@ -2023,7 +2023,7 @@
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           "dev": true,
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-            "kind-of": "6.0.2"
+            "kind-of": "^6.0.0"
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@@ -2032,7 +2032,7 @@
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           "dev": true,
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-            "kind-of": "6.0.2"
+            "kind-of": "^6.0.0"
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@@ -2041,9 +2041,9 @@
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-            "is-data-descriptor": "1.0.0",
-            "kind-of": "6.0.2"
+            "is-accessor-descriptor": "^1.0.0",
+            "is-data-descriptor": "^1.0.0",
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@@ -2060,9 +2060,9 @@
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       "dev": true,
       "requires": {
-        "ansi-gray": "0.1.1",
-        "color-support": "1.1.3",
-        "time-stamp": "1.1.0"
+        "ansi-gray": "^0.1.1",
+        "color-support": "^1.1.3",
+        "time-stamp": "^1.0.0"
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@@ -2077,8 +2077,8 @@
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       "dev": true,
       "requires": {
-        "escape-string-regexp": "1.0.5",
-        "object-assign": "4.1.1"
+        "escape-string-regexp": "^1.0.5",
+        "object-assign": "^4.1.0"
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@@ -2087,8 +2087,8 @@
       "integrity": "sha1-RMYepgeuS+nBQC9B9EJwy/4zT/g=",
       "dev": true,
       "requires": {
-        "flat-cache": "1.3.0",
-        "object-assign": "4.1.1"
+        "flat-cache": "^1.2.1",
+        "object-assign": "^4.0.1"
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@@ -2103,10 +2103,10 @@
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       "dev": true,
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-        "is-number": "3.0.0",
-        "repeat-string": "1.6.1",
-        "to-regex-range": "2.1.1"
+        "extend-shallow": "^2.0.1",
+        "is-number": "^3.0.0",
+        "repeat-string": "^1.6.1",
+        "to-regex-range": "^2.1.0"
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@@ -2115,7 +2115,7 @@
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           "dev": true,
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-            "is-extendable": "0.1.1"
+            "is-extendable": "^0.1.0"
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@@ -2126,9 +2126,9 @@
       "integrity": "sha1-yN765XyKUqinhPnjHFfHQumToLk=",
       "dev": true,
       "requires": {
-        "commondir": "1.0.1",
-        "mkdirp": "0.5.1",
-        "pkg-dir": "1.0.0"
+        "commondir": "^1.0.1",
+        "mkdirp": "^0.5.1",
+        "pkg-dir": "^1.0.0"
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@@ -2143,8 +2143,8 @@
       "integrity": "sha1-ay6YIrGizgpgq2TWEOzK1TyyTQ8=",
       "dev": true,
       "requires": {
-        "path-exists": "2.1.0",
-        "pinkie-promise": "2.0.1"
+        "path-exists": "^2.0.0",
+        "pinkie-promise": "^2.0.0"
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@@ -2153,10 +2153,10 @@
       "integrity": "sha1-kyaxSIwi0aYIhlCoaQGy2akKLLw=",
       "dev": true,
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-        "detect-file": "1.0.0",
-        "is-glob": "3.1.0",
-        "micromatch": "3.1.10",
-        "resolve-dir": "1.0.1"
+        "detect-file": "^1.0.0",
+        "is-glob": "^3.1.0",
+        "micromatch": "^3.0.4",
+        "resolve-dir": "^1.0.1"
       }
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@@ -2165,11 +2165,11 @@
       "integrity": "sha1-s33IRLdqL15wgeiE98CuNE8VNHY=",
       "dev": true,
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-        "object.defaults": "1.1.0",
-        "object.pick": "1.3.0",
-        "parse-filepath": "1.0.2"
+        "expand-tilde": "^2.0.2",
+        "is-plain-object": "^2.0.3",
+        "object.defaults": "^1.1.0",
+        "object.pick": "^1.2.0",
+        "parse-filepath": "^1.0.1"
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@@ -2190,10 +2190,10 @@
       "integrity": "sha1-0wMLMrOBVPTjt+nHCfSQ9++XxIE=",
       "dev": true,
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-        "circular-json": "0.3.3",
-        "del": "2.2.2",
-        "graceful-fs": "4.1.11",
-        "write": "0.2.1"
+        "circular-json": "^0.3.1",
+        "del": "^2.0.2",
+        "graceful-fs": "^4.1.2",
+        "write": "^0.2.1"
       }
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@@ -2208,7 +2208,7 @@
       "integrity": "sha1-xjMy9BXO3EsE2/5wz4NklMU8tEs=",
       "dev": true,
       "requires": {
-        "for-in": "1.0.2"
+        "for-in": "^1.0.1"
       }
     },
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@@ -2217,7 +2217,7 @@
       "integrity": "sha1-QpD60n8T6Jvn8zeZxrxaCr//DRk=",
       "dev": true,
       "requires": {
-        "map-cache": "0.2.2"
+        "map-cache": "^0.2.2"
       }
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     "fs-exists-sync": {
@@ -2239,8 +2239,8 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "nan": "2.11.0",
-        "node-pre-gyp": "0.10.0"
+        "nan": "^2.9.2",
+        "node-pre-gyp": "^0.10.0"
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@@ -2252,7 +2252,8 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -2273,12 +2274,14 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "balanced-match": "1.0.0",
             "concat-map": "0.0.1"
@@ -2293,17 +2296,20 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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         "core-util-is": {
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@@ -2420,7 +2426,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
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           "version": "1.3.5",
@@ -2432,6 +2439,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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           }
@@ -2446,6 +2454,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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           }
@@ -2453,12 +2462,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "5.1.1",
             "yallist": "3.0.2"
@@ -2477,6 +2488,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -2557,7 +2569,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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         "object-assign": {
           "version": "4.1.1",
@@ -2569,6 +2582,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1.0.2"
           }
@@ -2654,7 +2668,8 @@
         "safe-buffer": {
           "version": "5.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "2.1.2",
@@ -2690,6 +2705,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "1.1.0",
             "is-fullwidth-code-point": "1.0.0",
@@ -2709,6 +2725,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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           }
@@ -2752,12 +2769,14 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
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-        "json5": "0.5.1",
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-        "lodash.keys": "3.1.2"
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-        "lodash.keys": "3.1.2"
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@@ -3974,9 +3993,9 @@
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-        "lodash._cacheindexof": "3.0.2",
-        "lodash._createcache": "3.1.2"
+        "lodash._baseindexof": "^3.0.0",
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-        "lodash.isarray": "3.0.4"
+        "lodash.isarguments": "^3.0.0",
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-        "lodash._isiterateecall": "3.0.9",
-        "lodash.restparam": "3.6.1"
+        "lodash._bindcallback": "^3.0.0",
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+        "lodash._getnative": "^3.0.0"
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@@ -4069,8 +4088,8 @@
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-        "lodash.keysin": "3.0.8"
+        "lodash._basefor": "^3.0.0",
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-        "lodash._createassigner": "3.1.1",
-        "lodash.keys": "3.1.2"
+        "lodash._baseassign": "^3.0.0",
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-        "lodash._bindcallback": "3.0.1"
+        "lodash._baseclone": "^3.0.0",
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@@ -4124,7 +4143,7 @@
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       "dev": true,
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@@ -4145,9 +4164,9 @@
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-        "lodash.isarguments": "3.1.0",
-        "lodash.keysin": "3.0.8"
+        "lodash._basefor": "^3.0.0",
+        "lodash.isarguments": "^3.0.0",
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@@ -4162,9 +4181,9 @@
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-        "lodash.isarguments": "3.1.0",
-        "lodash.isarray": "3.0.4"
+        "lodash._getnative": "^3.0.0",
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-        "lodash.isarray": "3.0.4"
+        "lodash.isarguments": "^3.0.0",
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-        "lodash.keys": "3.1.2",
-        "lodash.keysin": "3.0.8",
-        "lodash.toplainobject": "3.0.0"
+        "lodash._arraycopy": "^3.0.0",
+        "lodash._arrayeach": "^3.0.0",
+        "lodash._createassigner": "^3.0.0",
+        "lodash._getnative": "^3.0.0",
+        "lodash.isarguments": "^3.0.0",
+        "lodash.isarray": "^3.0.0",
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+        "lodash.keys": "^3.0.0",
+        "lodash.keysin": "^3.0.0",
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@@ -4202,14 +4221,14 @@
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-        "lodash._pickbycallback": "3.0.0",
-        "lodash.keysin": "3.0.8",
-        "lodash.restparam": "3.6.1"
+        "lodash._arraymap": "^3.0.0",
+        "lodash._basedifference": "^3.0.0",
+        "lodash._baseflatten": "^3.0.0",
+        "lodash._bindcallback": "^3.0.0",
+        "lodash._pickbyarray": "^3.0.0",
+        "lodash._pickbycallback": "^3.0.0",
+        "lodash.keysin": "^3.0.0",
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       "dev": true,
       "requires": {
-        "user-home": "1.1.1"
+        "user-home": "^1.1.1"
       },
       "dependencies": {
         "user-home": {
@@ -5915,8 +5934,8 @@
       "integrity": "sha1-sEVbOPxeDPMNQyUTLkYZcMIJHN4=",
       "dev": true,
       "requires": {
-        "clone": "1.0.4",
-        "clone-stats": "0.0.1",
+        "clone": "^1.0.0",
+        "clone-stats": "^0.0.1",
         "replace-ext": "0.0.1"
       }
     },
@@ -5926,14 +5945,14 @@
       "integrity": "sha1-mmhRzhysHBzqX+hsCTHWIMLPqeY=",
       "dev": true,
       "requires": {
-        "defaults": "1.0.3",
-        "glob-stream": "3.1.18",
-        "glob-watcher": "0.0.6",
-        "graceful-fs": "3.0.11",
-        "mkdirp": "0.5.1",
-        "strip-bom": "1.0.0",
-        "through2": "0.6.5",
-        "vinyl": "0.4.6"
+        "defaults": "^1.0.0",
+        "glob-stream": "^3.1.5",
+        "glob-watcher": "^0.0.6",
+        "graceful-fs": "^3.0.0",
+        "mkdirp": "^0.5.0",
+        "strip-bom": "^1.0.0",
+        "through2": "^0.6.1",
+        "vinyl": "^0.4.0"
       },
       "dependencies": {
         "clone": {
@@ -5948,7 +5967,7 @@
           "integrity": "sha1-dhPHeKGv6mLyXGMKCG1/Osu92Bg=",
           "dev": true,
           "requires": {
-            "natives": "1.1.4"
+            "natives": "^1.1.0"
           }
         },
         "isarray": {
@@ -5963,10 +5982,10 @@
           "integrity": "sha1-Elgg40vIQtLyqq+v5MKRbuMsFXw=",
           "dev": true,
           "requires": {
-            "core-util-is": "1.0.2",
-            "inherits": "2.0.3",
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.1",
             "isarray": "0.0.1",
-            "string_decoder": "0.10.31"
+            "string_decoder": "~0.10.x"
           }
         },
         "string_decoder": {
@@ -5981,8 +6000,8 @@
           "integrity": "sha1-QaucZ7KdVyCQcUEOHXp6lozTrUg=",
           "dev": true,
           "requires": {
-            "readable-stream": "1.0.34",
-            "xtend": "4.0.1"
+            "readable-stream": ">=1.0.33-1 <1.1.0-0",
+            "xtend": ">=4.0.0 <4.1.0-0"
           }
         },
         "vinyl": {
@@ -5991,8 +6010,8 @@
           "integrity": "sha1-LzVsh6VQolVGHza76ypbqL94SEc=",
           "dev": true,
           "requires": {
-            "clone": "0.2.0",
-            "clone-stats": "0.0.1"
+            "clone": "^0.2.0",
+            "clone-stats": "^0.0.1"
           }
         }
       }
@@ -6003,7 +6022,7 @@
       "integrity": "sha1-q2VJ1h0XLCsbh75cUI0jnI74dwU=",
       "dev": true,
       "requires": {
-        "source-map": "0.5.7"
+        "source-map": "^0.5.1"
       }
     },
     "vm-browserify": {
@@ -6021,9 +6040,9 @@
       "integrity": "sha1-Yuqkq15bo1/fwBgnVibjwPXj+ws=",
       "dev": true,
       "requires": {
-        "async": "0.9.2",
-        "chokidar": "1.7.0",
-        "graceful-fs": "4.1.11"
+        "async": "^0.9.0",
+        "chokidar": "^1.0.0",
+        "graceful-fs": "^4.1.2"
       },
       "dependencies": {
         "async": {
@@ -6040,21 +6059,21 @@
       "integrity": "sha1-T/MfU9sDM55VFkqdRo7gMklo/pg=",
       "dev": true,
       "requires": {
-        "acorn": "3.3.0",
-        "async": "1.5.2",
-        "clone": "1.0.4",
-        "enhanced-resolve": "0.9.1",
-        "interpret": "0.6.6",
-        "loader-utils": "0.2.17",
-        "memory-fs": "0.3.0",
-        "mkdirp": "0.5.1",
-        "node-libs-browser": "0.7.0",
-        "optimist": "0.6.1",
-        "supports-color": "3.2.3",
-        "tapable": "0.1.10",
-        "uglify-js": "2.7.5",
-        "watchpack": "0.2.9",
-        "webpack-core": "0.6.9"
+        "acorn": "^3.0.0",
+        "async": "^1.3.0",
+        "clone": "^1.0.2",
+        "enhanced-resolve": "~0.9.0",
+        "interpret": "^0.6.4",
+        "loader-utils": "^0.2.11",
+        "memory-fs": "~0.3.0",
+        "mkdirp": "~0.5.0",
+        "node-libs-browser": "^0.7.0",
+        "optimist": "~0.6.0",
+        "supports-color": "^3.1.0",
+        "tapable": "~0.1.8",
+        "uglify-js": "~2.7.3",
+        "watchpack": "^0.2.1",
+        "webpack-core": "~0.6.9"
       },
       "dependencies": {
         "interpret": {
@@ -6069,7 +6088,7 @@
           "integrity": "sha1-ZawFBLOVQXHYpklGsq48u4pfVPY=",
           "dev": true,
           "requires": {
-            "has-flag": "1.0.0"
+            "has-flag": "^1.0.0"
           }
         },
         "uglify-js": {
@@ -6078,10 +6097,10 @@
           "integrity": "sha1-RhLAx7qu4rp8SH3kkErhIgefLKg=",
           "dev": true,
           "requires": {
-            "async": "0.2.10",
-            "source-map": "0.5.7",
-            "uglify-to-browserify": "1.0.2",
-            "yargs": "3.10.0"
+            "async": "~0.2.6",
+            "source-map": "~0.5.1",
+            "uglify-to-browserify": "~1.0.0",
+            "yargs": "~3.10.0"
           },
           "dependencies": {
             "async": {
@@ -6100,8 +6119,8 @@
       "integrity": "sha1-/FcViMhVjad76e+23r3Fo7FyvcI=",
       "dev": true,
       "requires": {
-        "source-list-map": "0.1.8",
-        "source-map": "0.4.4"
+        "source-list-map": "~0.1.7",
+        "source-map": "~0.4.1"
       },
       "dependencies": {
         "source-map": {
@@ -6110,7 +6129,7 @@
           "integrity": "sha1-66T12pwNyZneaAMti092FzZSA2s=",
           "dev": true,
           "requires": {
-            "amdefine": "1.0.1"
+            "amdefine": ">=0.0.4"
           }
         }
       }
@@ -6127,7 +6146,7 @@
       "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
       "dev": true,
       "requires": {
-        "isexe": "2.0.0"
+        "isexe": "^2.0.0"
       }
     },
     "window-size": {
@@ -6154,7 +6173,7 @@
       "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
       "dev": true,
       "requires": {
-        "mkdirp": "0.5.1"
+        "mkdirp": "^0.5.1"
       }
     },
     "xml-escape": {
@@ -6175,9 +6194,9 @@
       "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
       "dev": true,
       "requires": {
-        "camelcase": "1.2.1",
-        "cliui": "2.1.0",
-        "decamelize": "1.2.0",
+        "camelcase": "^1.0.2",
+        "cliui": "^2.1.0",
+        "decamelize": "^1.0.0",
         "window-size": "0.1.0"
       }
     }
diff --git a/package.json b/package.json
index fabf959..c0272ed 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "nested-object-assign",
-  "version": "1.0.3",
+  "version": "1.0.4",
   "description": "Package to support nested merging of objects & properties, using Object.Assign",
   "main": "./index.js",
   "scripts": {
diff --git a/src/nestedObjectAssign.js b/src/nestedObjectAssign.js
index 2358fab..8bda54b 100644
--- a/src/nestedObjectAssign.js
+++ b/src/nestedObjectAssign.js
@@ -9,7 +9,7 @@ export default function nestedObjectAssign(target, ...sources){
 
     if (isObject(target) && isObject(source)){
         for (const key in source){
-            if (isObject(source[key])){
+            if (isObject(source[key]) && !isPrototypePolluted(key)){
                 if (!target[key]) {
                     Object.assign(target, {[key]: {}});
                 }
@@ -28,4 +28,8 @@ export default function nestedObjectAssign(target, ...sources){
     }
 
     return nestedObjectAssign(target, ...sources);
+}
+
+function isPrototypePolluted(key){
+    return /__proto__|constructor|prototype/.test(key);
 }
\ No newline at end of file
diff --git a/test/nestedObjectAssign.spec.js b/test/nestedObjectAssign.spec.js
index ef9ec8a..ea0c524 100644
--- a/test/nestedObjectAssign.spec.js
+++ b/test/nestedObjectAssign.spec.js
@@ -69,4 +69,10 @@ describe('Given an instance of nestedObjectAssign', function() {
             expect(JSON.stringify(nestedObjectAssign({}, mockData.default, mockData.first, mockData.second))).to.be.equal(JSON.stringify(expectedData));
         });
     });
+    describe('when I give malicious payload', function() {
+        it('it should not pollute object prototype', () => {
+            nestedObjectAssign({}, JSON.parse('{"__proto__": {"polluted": true}}'));
+            expect({}.polluted).to.be.equal(undefined);
+        });
+    });
 });
\ No newline at end of file