Core: Arrays like [42] should fail .isNumeric()

Fixes #14179

Author: dmethvin

src/core.js

@@ -216,7 +216,7 @@ jQuery.extend({
 		// parseFloat NaNs numeric-cast false positives (null|true|false|"")
 		// ...but misinterprets leading-number strings, particularly hex literals ("0x...")
 		// subtraction forces infinities to NaN
-		return obj - parseFloat( obj ) >= 0;
+		return !jQuery.isArray( obj ) && obj - parseFloat( obj ) >= 0;
 	},
 
 	isPlainObject: function( obj ) {

test/unit/core.js

@@ -457,7 +457,7 @@ test("isFunction", function() {
 });
 
 test( "isNumeric", function() {
-	expect( 36 );
+	expect( 38 );
 
 	var t = jQuery.isNumeric,
 		Traditionalists = /** @constructor */ function(n) {
@@ -505,6 +505,8 @@ test( "isNumeric", function() {
 	equal( t(Number.NEGATIVE_INFINITY), false, "Negative Infinity");
 	equal( t(rong), false, "Custom .toString returning non-number");
 	equal( t({}), false, "Empty object");
+	equal( t( [] ), false, "Empty array" );
+	equal( t( [ 42 ] ), false, "Array with one number" );
 	equal( t(function(){} ), false, "Instance of a function");
 	equal( t( new Date() ), false, "Instance of a Date");
 	equal( t(function(){} ), false, "Instance of a function");