OrderedDictionary becomes Hashtable when exported to and imported from clixml by Roman Kuzmin

The following script shows the problem:

    # new OrderedDictionary
    $t1 = [ordered] @{p1=11; p2=22; p3=33}

    # it is OrderedDictionary
    $t1.GetType().Name

    # export
    $t1 | Export-Clixml z1.clixml

    # import
    $t2 = Import-Clixml z1.clixml

    # it is not OrderedDictionary, it is Hashtable
    $t2.GetType().Name

Actual output:

    OrderedDictionary
    Hashtable

Expected output:

    OrderedDictionary
    OrderedDictionary