Assertion failure with 6-dimensional array in PL/python

create extension plpythonu;

-- from 'plpython_types' regression test
CREATE FUNCTION test_type_conversion_array_int4(x int4[]) RETURNS int4[] 
AS $$
plpy.info(x, type(x))
return x
$$ LANGUAGE plpythonu;

postgres=# SELECT * FROM test_type_conversion_array_int4(ARRAY [[[[[[ 1 
]]]]]]);
server closed the connection unexpectedly
    This probably means the server terminated abnormally
    before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.
!?>

TRAP: FailedAssertion("!(ndim < 6)", File: "plpy_typeio.c", Line: 686)

The assertion looks like this:

    if (ARR_NDIM(array) == 0)
        return PyList_New(0);

    /* Array dimensions and left bounds */
    ndim = ARR_NDIM(array);
    dims = ARR_DIMS(array);
    Assert(ndim < MAXDIM);     <-----

I believe that's wrong, it should be "ndim <= MAXDIM". Looks like I 
introduced this in commit 94aceed317, in v10.

I'll go fix that...

- Heikki