ActionScript 2.0 :: [Flash8] Bizarre Object Namespace Overlap?

I have come across a variable scoping issue in Actionscript 2.0 that seems rather odd. I create a Game class that has various types of properties:

class Game
{
public var test_number = new Number;
public var test_array = new Array;

[code]....

I can assign the numeric properties for each object just fine:

g1.test_number = 42;
g2.test_number = 23;

However, when I assign values to the array property:

g1.test_array[ 0 ] = 1;
g2.test_array[ 0 ] = 2;

...for some reason this will assign '2' to both of these values, even though they exist within separate Game objects! What's stranger is that they stay in their own discrete namespaces if I populate the arrays like this:

g1.test_array = [ 1, 2 ];
g2.test_array = [ 3, 4 ];

That works just fine- the overlapping-namespace problem does not occur. However, it does occur with the test_hash as well:

g1.test_hash.some_key = 1;
g2.test_hash.some_key = 2;

This code results in both g1 and g2 winding up with '2' in this value! How can this be? Is this a bug in actionscript?