Ensure _.isEqual performs comparisons between objects with shared property values correctly. [closes #415]

dist/lodash.underscore.min.js

@@ -7,11 +7,11 @@
 }function i(n){function r(){if(u){var n=e(u);Rr.apply(n,arguments)}if(this instanceof r){var i=f(t.prototype),n=t.apply(i,n||arguments);return O(n)?n:i}return t.apply(o,n||arguments)}var t=n[0],u=n[2],o=n[4];return r}function f(n){return O(n)?Br(n):{}}function a(n,r,t){if(typeof n!="function")return Y;if(typeof r=="undefined"||!("prototype"in n))return n;switch(t){case 1:return function(t){return n.call(r,t)};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 L(n,r)}function l(n){function r(){var n=p?a:this;if(o){var y=e(o);Rr.apply(y,arguments)}return(i||g)&&(y||(y=e(arguments)),i&&Rr.apply(y,i),g&&y.length<c)?(u|=16,l([t,h?u:-4&u,y,null,a,c])):(y||(y=arguments),s&&(t=n[v]),this instanceof r?(n=f(t.prototype),y=t.apply(n,y),O(y)?y:n):t.apply(n,y))}var t=n[0],u=n[1],o=n[2],i=n[3],a=n[4],c=n[5],p=1&u,s=2&u,g=4&u,h=8&u,v=t;return r}function c(n,r){for(var t=-1,e=m(),u=n?n.length:0,o=[];++t<u;){var i=n[t];
 0>e(r,i)&&o.push(i)}return o}function p(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"&&typeof i.length=="number"&&(Cr(i)||b(i))){r||(i=p(i,r,t));var f=-1,a=i.length,l=o.length;for(o.length+=a;++f<a;)o[l++]=i[f]}else t||o.push(i)}return o}function s(n,r,t,e){if(n===r)return 0!==n||1/n==1/r;if(n===n&&!(n&&vr[typeof n]||r&&vr[typeof r]))return false;if(null==n||null==r)return n===r;var o=Er.call(n),i=Er.call(r);if(o!=i)return false;switch(o){case lr:case cr:return+n==+r;
-case pr:return n!=+n?r!=+r:0==n?1/n==1/r:n==+r;case gr:case hr:return n==r+""}if(i=o==ar,!i){var f=n instanceof u,a=r instanceof u;if(f||a)return s(f?n.__wrapped__:n,a?r.__wrapped__:r,t,e);if(o!=sr)return false;if(o=n.constructor,f=r.constructor,o!=f&&!(A(o)&&o instanceof o&&A(f)&&f instanceof f)&&"constructor"in n&&"constructor"in r)return false}for(t||(t=[]),e||(e=[]),o=t.length;o--;)if(t[o]==n)return e[o]==r;var l=true,c=0;if(t.push(n),e.push(r),i){if(c=r.length,l=c==n.length)for(;c--&&(l=s(n[c],r[c],t,e)););return l
-}return Kr(r,function(r,u,o){return Nr.call(o,u)?(c++,!(l=Nr.call(n,u)&&s(n[u],r,t,e))&&er):void 0}),l&&Kr(n,function(n,r,t){return Nr.call(t,r)?!(l=-1<--c)&&er:void 0}),l}function g(n,r,t){for(var e=-1,u=m(),o=n?n.length:0,i=[],f=t?[]:i;++e<o;){var a=n[e],l=t?t(a,e,n):a;(r?!e||f[f.length-1]!==l:0>u(f,l))&&(t&&f.push(l),i.push(a))}return i}function h(n){return function(r,t,e){var u={};t=X(t,e,3),e=-1;var o=r?r.length:0;if(typeof o=="number")for(;++e<o;){var i=r[e];n(u,i,t(i,e,r),r)}else Lr(r,function(r,e,o){n(u,r,t(r,e,o),o)
-});return u}}function v(n,r,t,e,u,o){var f=16&r,a=32&r;if(!(2&r||A(n)))throw new TypeError;return f&&!t.length&&(r&=-17,t=false),a&&!e.length&&(r&=-33,e=false),(1==r||17===r?i:l)([n,r,t,e,u,o])}function y(n){return Vr[n]}function m(){var r=(r=u.indexOf)===G?n:r;return r}function _(n){return typeof n=="function"&&Ar.test(n)}function d(n){return Gr[n]}function b(n){return n&&typeof n=="object"&&typeof n.length=="number"&&Er.call(n)==fr||false}function w(n){if(!n)return n;for(var r=1,t=arguments.length;r<t;r++){var e=arguments[r];
-if(e)for(var u in e)n[u]=e[u]}return n}function j(n){if(!n)return n;for(var r=1,t=arguments.length;r<t;r++){var e=arguments[r];if(e)for(var u in e)"undefined"==typeof n[u]&&(n[u]=e[u])}return n}function x(n){var r=[];return Kr(n,function(n,t){A(n)&&r.push(t)}),r.sort()}function T(n){for(var r=-1,t=Ur(n),e=t.length,u={};++r<e;){var o=t[r];u[n[o]]=o}return u}function E(n){if(!n)return true;if(Cr(n)||N(n))return!n.length;for(var r in n)if(Nr.call(n,r))return false;return true}function A(n){return typeof n=="function"
-}function O(n){return!(!n||!vr[typeof n])}function S(n){return typeof n=="number"||n&&typeof n=="object"&&Er.call(n)==pr||false}function N(n){return typeof n=="string"||n&&typeof n=="object"&&Er.call(n)==hr||false}function R(n){for(var r=-1,t=Ur(n),e=t.length,u=Array(e);++r<e;)u[r]=n[t[r]];return u}function k(n,r){var t=m(),e=n?n.length:0,u=false;return e&&typeof e=="number"?u=-1<t(n,r):Lr(n,function(n){return(u=n===r)&&er}),u}function B(n,r,t){var e=true;r=X(r,t,3),t=-1;var u=n?n.length:0;if(typeof u=="number")for(;++t<u&&(e=!!r(n[t],t,n)););else Lr(n,function(n,t,u){return!(e=!!r(n,t,u))&&er
+case pr:return n!=+n?r!=+r:0==n?1/n==1/r:n==+r;case gr:case hr:return n==r+""}if(i=o==ar,!i){var f=n instanceof u,a=r instanceof u;if(f||a)return s(f?n.__wrapped__:n,a?r.__wrapped__:r,t,e);if(o!=sr)return false;if(o=n.constructor,f=r.constructor,o!=f&&!(A(o)&&o instanceof o&&A(f)&&f instanceof f)&&"constructor"in n&&"constructor"in r)return false}for(t||(t=[]),e||(e=[]),o=t.length;o--;)if(t[o]==n)return e[o]==r;var l=true,c=0;if(t.push(n),e.push(r),i){if(c=r.length,l=c==n.length)for(;c--&&(l=s(n[c],r[c],t,e)););}else Kr(r,function(r,u,o){return Nr.call(o,u)?(c++,!(l=Nr.call(n,u)&&s(n[u],r,t,e))&&er):void 0
+}),l&&Kr(n,function(n,r,t){return Nr.call(t,r)?!(l=-1<--c)&&er:void 0});return t.pop(),e.pop(),l}function g(n,r,t){for(var e=-1,u=m(),o=n?n.length:0,i=[],f=t?[]:i;++e<o;){var a=n[e],l=t?t(a,e,n):a;(r?!e||f[f.length-1]!==l:0>u(f,l))&&(t&&f.push(l),i.push(a))}return i}function h(n){return function(r,t,e){var u={};t=X(t,e,3),e=-1;var o=r?r.length:0;if(typeof o=="number")for(;++e<o;){var i=r[e];n(u,i,t(i,e,r),r)}else Lr(r,function(r,e,o){n(u,r,t(r,e,o),o)});return u}}function v(n,r,t,e,u,o){var f=16&r,a=32&r;
+if(!(2&r||A(n)))throw new TypeError;return f&&!t.length&&(r&=-17,t=false),a&&!e.length&&(r&=-33,e=false),(1==r||17===r?i:l)([n,r,t,e,u,o])}function y(n){return Vr[n]}function m(){var r=(r=u.indexOf)===G?n:r;return r}function _(n){return typeof n=="function"&&Ar.test(n)}function d(n){return Gr[n]}function b(n){return n&&typeof n=="object"&&typeof n.length=="number"&&Er.call(n)==fr||false}function w(n){if(!n)return n;for(var r=1,t=arguments.length;r<t;r++){var e=arguments[r];if(e)for(var u in e)n[u]=e[u]}return n
+}function j(n){if(!n)return n;for(var r=1,t=arguments.length;r<t;r++){var e=arguments[r];if(e)for(var u in e)"undefined"==typeof n[u]&&(n[u]=e[u])}return n}function x(n){var r=[];return Kr(n,function(n,t){A(n)&&r.push(t)}),r.sort()}function T(n){for(var r=-1,t=Ur(n),e=t.length,u={};++r<e;){var o=t[r];u[n[o]]=o}return u}function E(n){if(!n)return true;if(Cr(n)||N(n))return!n.length;for(var r in n)if(Nr.call(n,r))return false;return true}function A(n){return typeof n=="function"}function O(n){return!(!n||!vr[typeof n])
+}function S(n){return typeof n=="number"||n&&typeof n=="object"&&Er.call(n)==pr||false}function N(n){return typeof n=="string"||n&&typeof n=="object"&&Er.call(n)==hr||false}function R(n){for(var r=-1,t=Ur(n),e=t.length,u=Array(e);++r<e;)u[r]=n[t[r]];return u}function k(n,r){var t=m(),e=n?n.length:0,u=false;return e&&typeof e=="number"?u=-1<t(n,r):Lr(n,function(n){return(u=n===r)&&er}),u}function B(n,r,t){var e=true;r=X(r,t,3),t=-1;var u=n?n.length:0;if(typeof u=="number")for(;++t<u&&(e=!!r(n[t],t,n)););else Lr(n,function(n,t,u){return!(e=!!r(n,t,u))&&er
 });return e}function F(n,r,t){var e=[];r=X(r,t,3),t=-1;var u=n?n.length:0;if(typeof u=="number")for(;++t<u;){var o=n[t];r(o,t,n)&&e.push(o)}else Lr(n,function(n,t,u){r(n,t,u)&&e.push(n)});return e}function q(n,r,t){r=X(r,t,3),t=-1;var e=n?n.length:0;if(typeof e!="number"){var u;return Lr(n,function(n,t,e){return r(n,t,e)?(u=n,er):void 0}),u}for(;++t<e;){var o=n[t];if(r(o,t,n))return o}}function D(n,r,t){var e=-1,u=n?n.length:0;if(r=r&&typeof t=="undefined"?r:a(r,t,3),typeof u=="number")for(;++e<u&&r(n[e],e,n)!==er;);else Lr(n,r)
 }function I(n,r){var t=n?n.length:0;if(typeof t=="number")for(;t--&&false!==r(n[t],t,n););else{var e=Ur(n),t=e.length;Lr(n,function(n,u,o){return u=e?e[--t]:--t,false===r(o[u],u,o)&&er})}}function M(n,r,t){var e=-1,u=n?n.length:0;if(r=X(r,t,3),typeof u=="number")for(var o=Array(u);++e<u;)o[e]=r(n[e],e,n);else o=[],Lr(n,function(n,t,u){o[++e]=r(n,t,u)});return o}function $(n,r,t){var e=-1/0,u=e;typeof r!="function"&&t&&t[r]===n&&(r=null);var o=-1,i=n?n.length:0;if(null==r&&typeof i=="number")for(;++o<i;)t=n[o],t>u&&(u=t);
 else r=X(r,t,3),D(n,function(n,t,o){t=r(n,t,o),t>e&&(e=t,u=n)});return u}function W(n,r,t,e){if(!n)return t;var u=3>arguments.length;r=X(r,e,4);var o=-1,i=n.length;if(typeof i=="number")for(u&&(t=n[++o]);++o<i;)t=r(t,n[o],o,n);else Lr(n,function(n,e,o){t=u?(u=false,n):r(t,n,e,o)});return t}function z(n,r,t,e){var u=3>arguments.length;return r=X(r,e,4),I(n,function(n,e,o){t=u?(u=false,n):r(t,n,e,o)}),t}function C(n){var r=-1,t=n?n.length:0,e=Array(typeof t=="number"?t:0);return D(n,function(n){var t;t=++r,t=0+Sr(Wr()*(t-0+1)),e[r]=e[t],e[t]=n