Index: class-wp-xmlrpc-server.php
===================================================================
--- class-wp-xmlrpc-server.php	(revision 20599)
+++ class-wp-xmlrpc-server.php	(working copy)
@@ -3184,7 +3184,7 @@
 			'userid'    => $post_data['post_author'],
 			'dateCreated' => $this->_convert_date( $post_data['post_date'] ),
 			'content'     => $content,
-			'postid'  => (string) $post_data['ID']
+			'postid'  => $post_data['ID']
 		);
 
 		return $struct;
@@ -3238,7 +3238,7 @@
 				'userid' => $entry['post_author'],
 				'dateCreated' => $post_date,
 				'content' => $content,
-				'postid' => (string) $entry['ID'],
+				'postid' => $entry['ID'],
 			);
 
 		}
@@ -4295,7 +4295,7 @@
 			$struct[] = array(
 				'dateCreated' => $post_date,
 				'userid' => $entry['post_author'],
-				'postid' => (string) $entry['ID'],
+				'postid' => $entry['ID'],
 				'description' => $post['main'],
 				'title' => $entry['post_title'],
 				'link' => $link,
@@ -4512,7 +4512,7 @@
 			$struct[] = array(
 				'dateCreated' => $post_date,
 				'userid' => $entry['post_author'],
-				'postid' => (string) $entry['ID'],
+				'postid' => $entry['ID'],
 				'title' => $entry['post_title'],
 				'post_status' => $entry['post_status'],
 				'date_created_gmt' => $post_date_gmt