Index: wp-admin/menu.php
===================================================================
--- wp-admin/menu.php	(revision 17521)
+++ wp-admin/menu.php	(working copy)
@@ -112,7 +112,7 @@
 	// Check if it should be a submenu.
 	if ( $ptype_obj->show_in_menu !== true )
 		continue;
-	$ptype_menu_position = is_int( $ptype_obj->menu_position ) ? $ptype_obj->menu_position : ++$_wp_last_object_menu; // If we're to use $_wp_last_object_menu, increment it first.
+	$ptype_menu_position = is_numeric( $ptype_obj->menu_position ) ? $ptype_obj->menu_position : ++$_wp_last_object_menu; // If we're to use $_wp_last_object_menu, increment it first.
 	$ptype_for_id = sanitize_html_class( $ptype );
 	if ( is_string( $ptype_obj->menu_icon ) ) {
 		$menu_icon   = esc_url( $ptype_obj->menu_icon );