integer instead of 'double precision'?

Query

---------------------

select

1/3

from

storage

limit 1

?column?

integer

0

?column?

double precision

0.33333...

Since there is no column type to begin with as this is a made-up column, shouldn't postgres know it is double precision due to the remainder?

I thought perhaps I could cast it as double precision as noted on http://www.postgresql.org/docs/8.3/interactive/sql-expressions.html

though doing the following:

results in:

float8

double precision

0

any ideas on how to get this type of a manufactured column (not sure the right term for it) to show the double precision result?