[fw-db] Zend_Db last_insert_id returns super big number

I have a MySql table whose primary key is a 64bit BigInt type

I'm using Zend_Db to insert a new row, then call lastInsertId() to retreive
the new row's id, what I get back is a super large number such as
18446744072633694008, and this number changes from time to time, but always
this large. the auto increment index is set to 0, and in the database the
record actually got inserted with correct primary id, (0, 1, 2...), it's
just that the id return from lastInsertId() gives weird number. Is it a
known issue for Zend_db, which doesn't deal with 64 bit number?

environment:
Zend Framework 1.8.4
Apache2 on 32bit box, Ubuntu OS
MySQL5.1
PHP5.2.4
MySQL adapter: mysqli

Thanks

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