forget the instrument_class(). 

i do a separate MapExt, and append it to the mapper.extensions 
manualy. So if this post-mapper() append'ing does not screw things 
up, all else is ok.

> i have another option to forget the above auto-approach and add the
> extension separately, after the mapper(...) is ready - like
> mapr.extension.append(e).
> Is there anything wrong or that needs be done over it?


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