ezunits tellsimpafter rules in user code

Dear Maxima Users,

the Maxima fileshare\ezunits\ezunits_functions.mac contains:

     tellsimpafter (abs (aa% ` bb%), abs (aa%) ` bb%);

I want to have the same rule for signum, and if I add this directly to 
the same file:

     tellsimpafter (signum (aa% ` bb%), signum (aa%) ` bb%);

it works as expected. But If I add the same rule to my user code (after 
loading ezunits) it doesn't. I guess the definition of the backtick 
changes on the way.

Is there a way to define rules like that for abs in user code after 
loading ezunits?

Thanks and best regards,

Michael



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