Duplicated relationships on version 1.8.1

I'm not able to track since wich version the 'update' method of the 'MBR_Storage' class isn't validating the $meta_value array for containing only unique values but I can explain it this way:

In version 1.7.0, there was a 'RWMBR_Table_Storage' class instead of the current 'MBR_Storage' class and the 'update' method had the following code:

$values = array();
  foreach ( $meta_value as $id ) {
  $value = isset( $order[ $id ] ) ? $order[ $id ] : 0;
  $values[ $id ] = $value; // this replaces duplicate values
}

So, when you add a duplicated relationship, it would be overwritten on save, but now, in version 1.8.1, the $meta_value array doesn't remove duplicated values, so you can have unlimited identical relationships causing an strange behavior on WP Queries, specially on User Queries

I think the easiest solution is adding something like:

$meta_value = array_unique( $meta_value );

Inside the 'update' method, does it make sense?