Why don't we accept exponential format for integers?

Folks,

Is there any good reason that this works:

postgres=# select ('1e+01'::numeric)::integer
postgres-# ;
int4
------
10

But this doesn't?

postgres=# select '1e+01'::Integer
postgres-# ;
ERROR: invalid input syntax for integer: "1e+01"
LINE 1: select '1e+01'::Integer

... or did we just never implement it?

--
-- Josh Berkus
PostgreSQL Experts Inc.
http://www.pgexperts.com