Revert [14695]. We need to be a bit less strict. see #13317.

git-svn-id: http://svn.automattic.com/wordpress/trunk@14780 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/pluggable.php

@@ -102,9 +102,6 @@ if ( !function_exists('get_userdata') ) :
  */
 function get_userdata( $user_id ) {
 	global $wpdb;
-
-	if ( ! is_numeric( $user_id ) )
-		return false;
 		
 	$user_id = absint( $user_id );
 	if ( ! $user_id )