From 7103d8ef47e04a4cf373abee0e8bfa9062fd616f Mon Sep 17 00:00:00 2001
From: Steve Mao <maochenyan@gmail.com>
Date: Thu, 14 Jan 2016 20:22:15 +1100
Subject: Core: Improve isNumeric logic and test coverage

Also add back accidentally deleted comments about the implementation.

Fixes gh-2780
Ref gh-2663
Ref gh-2781
Closes gh-2827
---
 src/core.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/core.js b/src/core.js
index 3a54ffc0e..b10128c7a 100644
--- a/src/core.js
+++ b/src/core.js
@@ -217,7 +217,11 @@ jQuery.extend( {
 		// that can be coerced to finite numbers (gh-2662)
 		var type = jQuery.type( obj );
 		return ( type === "number" || type === "string" ) &&
-			( obj - parseFloat( obj ) + 1 ) >= 0;
+
+			// parseFloat NaNs numeric-cast false positives ("")
+			// ...but misinterprets leading-number strings, particularly hex literals ("0x...")
+			// subtraction forces infinities to NaN
+			!isNaN( obj - parseFloat( obj ) );
 	},
 
 	isPlainObject: function( obj ) {
-- 
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