remove useless stuff
While we don't know the total (null) we continue to requeue.

In charge to developper to make extractor that gets an end by setting $total just when they know it.
Let the possibility to calculate the total in the first loop.

As we don't need the total until we go out the extractor
For now, only string will be consider as local metadata

Metadata system need big improvements...

We should dissociate LocalMetadata brings in each message, than global metadata.
That should be the next refactoring