Migration with blobs

Hi all,
I am trying to use migrate on my application and works great except
for the blob elements in my schema. MYSQL wants me to declare
LARGEBLOB for images the size I need to store but unfortunatly migrate
seems to just declare :binary as plain ol’ blobs. I like the idea of a
database agnostic database description but I’d like to find away to
specify the size of the blob elements.

Anyone know if there is a :size parameter or something that I am
missing?

Thanks,
Mark