Changing array subscripting to zero-offset

Hello everyone -

Array columns are, by default, 1-offset in their
subscripting.  Since I usually call postgres
from a language with zero-offset, I would prefer
that postgres conform to that.  The online
documentation hints that this may be configurable
but I haven't been able to find how this is done.

Does anyone know how to do this?

Thanks,
Erin Sheldon