Index: wp-includes/class.wp-scripts.php
===================================================================
--- wp-includes/class.wp-scripts.php	(revision 25325)
+++ wp-includes/class.wp-scripts.php	(working copy)
@@ -142,13 +142,13 @@
 		}
 
 		foreach ( (array) $l10n as $key => $value ) {
-			if ( !is_scalar($value) )
+			if ( is_bool( $value ) || ! is_scalar( $value ) )
 				continue;
 
 			$l10n[$key] = html_entity_decode( (string) $value, ENT_QUOTES, 'UTF-8');
 		}
 
-		$script = "var $object_name = " . json_encode($l10n) . ';';
+		$script = "var $object_name = " . defined( 'JSON_NUMERIC_CHECK' ) ? json_encode( $l10n, JSON_NUMERIC_CHECK ) : json_encode( $l10n ) . ';';
 
 		if ( !empty($after) )
 			$script .= "\n$after;";