MySQL IV vs PV

Is there anything in a db handle or statement handle one use to know
whether the running instance of DBD::MySQL will return integer columns
as IV?

I'm adding some code to a layer atop DBI which will force IV (via +=0),
but want to avoid doing that were it is not required.

The particular code path serializes the returned rows via JSON::XS,
hense the need.

-JimC
-- 
James Cloos <[email protected]>         OpenPGP: 0x997A9F17ED7DAEA6