SELECT x'00000000F'::int leading zeros causes "integer out of range"

Is this expected behavior ?

This works:

ts=# SELECT x'0000000F'::int;
int4|15

.. but an additional leading zero causes it to fail:

ts=# SELECT x'00000000F'::int;
ERROR: 22003: integer out of range
LOCATION: bittoint4, varbit.c:1575

|/* Check that the bit string is not too long */
|if (VARBITLEN(arg) > sizeof(result) * BITS_PER_BYTE)
| ereport(ERROR,
| (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
| errmsg("integer out of range")));

Justin