added suggested speed boost for isNumber

index.html

@@ -1086,7 +1086,8 @@ _([1, 2, 3]).value();
       
       <p>
         <b class="header">0.5.7</b><br />
-        A safer implementation of <tt>_.isArguments</tt>, thanks to 
+        A safer implementation of <tt>_.isArguments</tt>, and a 
+        faster <tt>_.isNumber</tt>, thanks to 
         <a href="http://jedschmidt.com/">Jed Schmidt</a>.
       </p>
       

test/temp.js

@@ -8,18 +8,20 @@
   var objects = _.map(numbers, function(n){ return {num : n}; });
   var randomized = _.sortBy(numbers, function(){ return Math.random(); });
 
-  JSLitmus.test('_.each()', function() {
-    var timesTwo = [];
-    _.each(numbers, function(num){ timesTwo.push(num * 2); });
-    return timesTwo;
+  JSLitmus.test('_.isNumber', function() {
+    return _.isNumber(1000)
   });
 
-  JSLitmus.test('_.isString', function() {
-    return _.isString(str);
+  JSLitmus.test('_.newIsNumber', function() {
+    return _.newIsNumber(1000)
   });
 
-  JSLitmus.test('_.isStringNew', function() {
-    return _.isStringNew(str);
+  JSLitmus.test('_.isNumber(NaN)', function() {
+    return _.isNumber(NaN)
+  });
+
+  JSLitmus.test('_.newIsNumber(NaN)', function() {
+    return _.newIsNumber(NaN)
   });
 
 })();

underscore-min.js

@@ -10,8 +10,8 @@ a.length;d--;)if(a[d]===c)return d;return-1};b.range=function(a,c,d){var e=b.toA
 return a};b.delay=function(a,c){var d=b.rest(arguments,2);return setTimeout(function(){return a.apply(a,d)},c)};b.defer=function(a){return b.delay.apply(b,[a,1].concat(b.rest(arguments)))};b.wrap=function(a,c){return function(){var d=[a].concat(b.toArray(arguments));return c.apply(c,d)}};b.compose=function(){var a=b.toArray(arguments);return function(){for(var c=b.toArray(arguments),d=a.length-1;d>=0;d--)c=[a[d].apply(this,c)];return c[0]}};b.keys=function(a){if(b.isArray(a))return b.range(0,a.length);
 var c=[];for(var d in a)q.call(a,d)&&c.push(d);return c};b.values=function(a){return b.map(a,b.identity)};b.functions=function(a){return b.select(b.keys(a),function(c){return b.isFunction(a[c])}).sort()};b.extend=function(a,c){for(var d in c)a[d]=c[d];return a};b.clone=function(a){if(b.isArray(a))return a.slice(0);return b.extend({},a)};b.tap=function(a,c){c(a);return a};b.isEqual=function(a,c){if(a===c)return true;var d=typeof a;if(d!=typeof c)return false;if(a==c)return true;if(!a&&c||a&&!c)return false;
 if(a.isEqual)return a.isEqual(c);if(b.isDate(a)&&b.isDate(c))return a.getTime()===c.getTime();if(b.isNaN(a)&&b.isNaN(c))return true;if(b.isRegExp(a)&&b.isRegExp(c))return a.source===c.source&&a.global===c.global&&a.ignoreCase===c.ignoreCase&&a.multiline===c.multiline;if(d!=="object")return false;if(a.length&&a.length!==c.length)return false;d=b.keys(a);var e=b.keys(c);if(d.length!=e.length)return false;for(var f in a)if(!b.isEqual(a[f],c[f]))return false;return true};b.isEmpty=function(a){return b.keys(a).length==
-0};b.isElement=function(a){return!!(a&&a.nodeType==1)};b.isArray=function(a){return!!(a&&a.concat&&a.unshift)};b.isArguments=function(a){return a&&b.isNumber(a.length)&&!a.concat&&!a.substr&&!a.apply&&!r.call(a,"length")};b.isFunction=function(a){return!!(a&&a.constructor&&a.call&&a.apply)};b.isString=function(a){return!!(a===""||a&&a.charCodeAt&&a.substr)};b.isNumber=function(a){return p.call(a)==="[object Number]"};b.isDate=function(a){return!!(a&&a.getTimezoneOffset&&a.setUTCFullYear)};b.isRegExp=
-function(a){return!!(a&&a.test&&a.exec&&(a.ignoreCase||a.ignoreCase===false))};b.isNaN=function(a){return b.isNumber(a)&&isNaN(a)};b.isNull=function(a){return a===null};b.isUndefined=function(a){return typeof a=="undefined"};b.noConflict=function(){j._=n;return this};b.identity=function(a){return a};b.breakLoop=function(){throw m;};var s=0;b.uniqueId=function(a){var c=s++;return a?a+c:c};b.templateSettings={start:"<%",end:"%>",interpolate:/<%=(.+?)%>/g};b.template=function(a,c){var d=b.templateSettings;
+0};b.isElement=function(a){return!!(a&&a.nodeType==1)};b.isArray=function(a){return!!(a&&a.concat&&a.unshift)};b.isArguments=function(a){return a&&b.isNumber(a.length)&&!a.concat&&!a.substr&&!a.apply&&!r.call(a,"length")};b.isFunction=function(a){return!!(a&&a.constructor&&a.call&&a.apply)};b.isString=function(a){return!!(a===""||a&&a.charCodeAt&&a.substr)};b.isNumber=function(a){return a===+a||p.call(a)==="[object Number]"};b.isDate=function(a){return!!(a&&a.getTimezoneOffset&&a.setUTCFullYear)};
+b.isRegExp=function(a){return!!(a&&a.test&&a.exec&&(a.ignoreCase||a.ignoreCase===false))};b.isNaN=function(a){return b.isNumber(a)&&isNaN(a)};b.isNull=function(a){return a===null};b.isUndefined=function(a){return typeof a=="undefined"};b.noConflict=function(){j._=n;return this};b.identity=function(a){return a};b.breakLoop=function(){throw m;};var s=0;b.uniqueId=function(a){var c=s++;return a?a+c:c};b.templateSettings={start:"<%",end:"%>",interpolate:/<%=(.+?)%>/g};b.template=function(a,c){var d=b.templateSettings;
 a=new Function("obj","var p=[],print=function(){p.push.apply(p,arguments);};with(obj){p.push('"+a.replace(/[\r\t\n]/g," ").replace(new RegExp("'(?=[^"+d.end[0]+"]*"+d.end+")","g"),"\t").split("'").join("\\'").split("\t").join("'").replace(d.interpolate,"',$1,'").split(d.start).join("');").split(d.end).join("p.push('")+"');}return p.join('');");return c?a(c):a};b.forEach=b.each;b.foldl=b.inject=b.reduce;b.foldr=b.reduceRight;b.filter=b.select;b.every=b.all;b.some=b.any;b.head=b.first;b.tail=b.rest;
 b.methods=b.functions;var l=function(a,c){return c?b(a).chain():a};b.each(b.functions(b),function(a){var c=b[a];i.prototype[a]=function(){var d=b.toArray(arguments);o.call(d,this._wrapped);return l(c.apply(b,d),this._chain)}});b.each(["pop","push","reverse","shift","sort","splice","unshift"],function(a){var c=Array.prototype[a];i.prototype[a]=function(){c.apply(this._wrapped,arguments);return l(this._wrapped,this._chain)}});b.each(["concat","join","slice"],function(a){var c=Array.prototype[a];i.prototype[a]=
 function(){return l(c.apply(this._wrapped,arguments),this._chain)}});i.prototype.chain=function(){this._chain=true;return this};i.prototype.value=function(){return this._wrapped}})();

underscore.js

@@ -503,7 +503,7 @@
 
   // Is a given value a number?
   _.isNumber = function(obj) {
-    return toString.call(obj) === '[object Number]';
+    return (obj === +obj) || (toString.call(obj) === '[object Number]');
   };
 
   // Is a given value a date?