fair enough, but...

1. i really do not see that behaviour documented, i.e.

       http://docs.python.org/lib/node347.html

   says nothing about types being broken on space character.

2. i am bit missing the point about backward compability.
   when looking on internet for a reason why types like
   "numeric(10, 2)" are not being converted (please note
   that "numeric (10, 2)" works, the difference is just one
   space), then i found no explanation of such behaviour,
   no single line of code trying to register conversion
   of "numeric(10,)" or similar.

   even more. if somebody has declaration like

      register_converter("numeric(10,", Decimal)

   then i can bet that he has also

      register_converter("numeric", Decimal)

   i doubt that my patch is breaking anybody's code, as no one
   is going to register "numeric(10," without registering "numeric".