Nested container reference bug?

[bmistree]

Map<from: Number, to: Map <from: Number, to: Text>> nested_map;

Map<from: Number, to: Text> internal_map = nested_map[1];

internal_map = nested_map[2];

Pretty sure that now nested_map[1] will also point to nested_map[2]. This may be because we are returning direct references to internal map values when call get_val_on_key.