please include a shortest possible self-contained script that reproduces the behavior

Here's my quickie test.

<?php

function test()
{
  var_dump(func_get_arg(0));
}

$mya = array( array(1,2,3), array(3,4,5) );

test("$mya");
test($mya);

?>

string(5) "Array"
array(2) {
  [0]=>
  array(3) {
    [0]=>
    int(1)
    [1]=>
    int(2)
    [2]=>
    int(3)
  }
  [1]=>
  array(3) {
    [0]=>
    int(3)
    [1]=>
    int(4)
    [2]=>
    int(5)
  }
}

As you can see it works just fine(> 4.0.2), you just can't put quotes around it (it isnt a string after all), which you may be doing.

-Chris

this should be open not feedback