"unrecognised attribute name or invalid value"

Hello,

I am building a new XS-based DBD driver, using the best practices of
cargo-cult programming as recommended in the manual.

However, on every connect() attempt, I get the following unsilencable
warnings:

Can't set DBI::db=HASH(0x20e7098)->{State}: unrecognised attribute name or
invalid value at /usr/lib64/perl5/vendor_perl/DBI.pm line 720.
Can't set DBI::db=HASH(0x20e7098)->{Errstr}: unrecognised attribute name or
invalid value at /usr/lib64/perl5/vendor_perl/DBI.pm line 720.
Can't set DBI::db=HASH(0x20e7098)->{Driver}: unrecognised attribute name or
invalid value at /usr/lib64/perl5/vendor_perl/DBI.pm line 720.
Can't set DBI::db=HASH(0x20e7098)->{Err}: unrecognised attribute name or
invalid value at /usr/lib64/perl5/vendor_perl/DBI.pm line 720.

How can I make them go away? Err and Errstr both work in my driver, so it
seems to me I am handling them correctly.

Thank you!

Philip Stoev