I am still not getting it.

If you have some A that doesn't just come from heaven. Maybe if your 
current domain is of type UPOLYC you are satisfied to ask for the other 
domain:

   if A has UPOLYC then
      -- use the coerce from your UPOLYCoerce package

I think, I stop here and wait for very concrete use cases of yours.
Maybe you send me some concrete pieces of your code and we stop spamming 
the list until we have a result.

Ralf

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