troubles with postgresql

Hi,
There are 2 things that disturb me in postgresql:
- apparently, there is no unsigned number type. why ??? This is very useful,
especially for serials.
- when we get a record containing a fixed sized string rows, we always get a
string that is filled with spaces at the end to match max size. Again, why ?
There is no need for these spaces, and I guess those spaces are sent through
the network, which is not optimal...

Can a developper of PostgreSQL answer my questions ?



                    Thanks.


                        Erwan