Why their is a limit in Postgresql (psql) Parameters..?

Hi All,

     I'm using Postgresql v7.3.3. I have a small question ...

     Why is that there is a maximum limit of 32 input parameters to the
Postgresql function?
      Whereas stored procedures in Oracle and SQL Server
take more than 32 input arguments. So this puts extra burden on the
middleware developer to handle this stiuation at the time of migrating
existing databases in SQL Server or Oracle to Postgresql.

Any Info/Suggestions will be highly appreciated.