Index: wp-includes/meta.php
===================================================================
--- wp-includes/meta.php	(revision 16013)
+++ wp-includes/meta.php	(working copy)
@@ -245,12 +245,10 @@
 
 	$check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single );
 	if ( null !== $check ) {
-		if ( !is_array( $check ) )
-			return $check;
-		elseif ( $single )
-			return maybe_unserialize( $check[0] );
+		if ( $single && is_array( $check ) )
+			return $check[0];
 		else
-			return array_map( 'maybe_unserialize', $check );
+			return $check;
 	}
 
 	$meta_cache = wp_cache_get($object_id, $meta_type . '_meta');