Hmm, I've tried that and gotten the following error:

ProgrammingError: (ProgrammingError) function discounted_price(unknown) is 
not unique
LINE 1: SELECT discounted_price('packages.*') AS discounted_price_1 
               ^
HINT:  Could not choose a best candidate function. You might need to add 
explicit type casts.
 'SELECT discounted_price(%(discounted_price_2)s) AS discounted_price_1 \n 
LIMIT %(param_1)s' {'param_1': 1, 'discounted_price_2': 'packages.*'} 

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