Strange results of CURRENT_TIMESTAMP

Hello,

During repopulation of the database (using the results of the pg_dump
program), I spot two strange things:

- fields defined as TIMESTAMP DEFAULT CURRENT_TIMESTAMP sometimes generate
invalid format of the date, for instance:

2001-02-10 13:11:60.00+01 - which follows the records
2001-02-10 13:10:59.00+01

Which means, that the proper timestamp should look like:
2001-02-10 13:11:00.00+01

- I have a float4 field, which contains the value 3e-40 (approximately).
I know it's there - the queries return it without any problem. Problem
occurs again when I try to repopulate the table. Having such a value
in a line generated by pg_dump (in form of COPY from stdin) I get
the error:

Bad float4 input format -- underflow.

When I redefine the field as a float8 everything works fine. But why
does it occur during repopulation - when in fact such a value did exist
in the table before the table was drop.

I'am running Postgresql 7.0.2

thanks for help

Mark