Number of dimensions of an array parameter

I can create a function that takes a two dimension int array:
 CREATE FUNCTION twodims(int[][]) RETURNS void AS ...

but there's nothing stopping me from calling this function with an 
arbitrary number of dimensions on the array.

I'd like to map a parameter like the one above to a corresponding 
representation in Java (it would be int[][] there too). As it turns out, 
I can't do that. PostgreSQL will not store any information that can tell 
me how many dimensions that where used in the declaration, i.e. it's 
impossible to write a language VALIDATOR that, based on the information 
in pg_proc, builds a signature where the number of dimensions is reflected.

This leaves me with two choices:

Only allow arrays with one dimension unless the parameter is of a domain 
type (domains are apparently stored with the actual number of 
dimensions). Any call that uses an array parameter with more then one 
dimension will yield an exception.  --OR--
Always map to Object[] instead of mapping to the correct type, . This 
will work since an array in Java is also an Object and all primitive 
types can be represented as objects (i.e. int can be a 
java.lang.Integer). The strong typing and the ability to use primitives 
are lost however.

I'm leaning towards #1 and hoping that PostgreSQL will enhance the 
parameter type declarations to include the dimensions in future releases.

... After some more testing ...

Unfortunately, I run into problems even when I use domains. Consider the 
following:

thhal=# CREATE DOMAIN twodims as int[][];
CREATE DOMAIN
thhal=# SELECT typndims FROM pg_type WHERE typname = 'twodims';typndims
----------       2
(1 row)

thhal=# SELECT array_dims('{{{1,2,3},{3,4,3}},{{5,3,2},{9,9,9}}}'::twodims);  array_dims   
-----------------[1:2][1:2][1:3]
(1 row)

IMO, there is something seriously wrong here. Clearly the number of 
dimensions is a property of the type. Any array with a different number 
of dimensions should yield an error or at least be coerced into the 
right number of dimensions.

Kind Regards,
Thomas Hallgren