SQL numeric -> CL rational?

Hello,

I just observe that numbers like 1.5 (of type 'numeric' in my Postgresql
database) appear as rationals 3/2 in SELECT queries or VIEW-CLASS
objects.

Was this changed recently?  If yes, is there a way to revert to the old
behavior?  I have an old application which I am reactivating and which
breaks at this point, and I am just wondering how I should fix it in the
most reasonable way.

Thank you,

Nicolas