Bug reporting?

I’m encountering quite a few “database error” messages that seem to be related to variable type mismatches or perhaps just plain old bugs in the code.

For example, if I edit my user info and leave the ICQ field blank, I get an error that says: WordPress database error: [Out of range value adjusted for column ‘user_icq’ at row 1]

The query reveals that it is trying to update user_icq with ”, but user_icq is supposed to be an int. In the profile.php code there is a check to make sure the if there is a value for ICQ that it is all numbers, but nothing that converts ” into an int so it can be inserted into the database.

It seems to me that this is buggy code, but I can’t find any mention of it on the forums. Where do I report a bug?

Edited to add: I’m using MySQL 5.0, which apparently may be the source of my problems.