numeric data type on 6.5

I thought numeric data type on 6.5 allows a very large precision. Am I
missing something?
--
Tatsuo Ishii

test=> create table t1(n numeric(100,0));
CREATE
test=> \d t1;
Table = t1
+----------------------------------+----------------------------------+-------+
| Field | Type | Length|
+----------------------------------+----------------------------------+-------+
| n | numeric | var |
+----------------------------------+----------------------------------+-------+
test=> insert into t1 values(100000000000000000000000000000);
NOTICE: Integer input '100000000000000000000000000000' is out of range; promoted to float
INSERT 149033 1
test=> select * from t1;
n
-
1
(1 row)