Deserialized CultureInfo throws NullReferenceException when accessing properties

[jarlrasm]

CultureInfo implementation of property-getters uses a private field that is null after deserializing, creating exceptions when accessing any property.

Test to confirm issue(put in CustomObjectTests.cs):

[Fact]
public void CanSerializeCultureInfo()
{
  var expected = CultureInfo.CurrentCulture;
  Serialize(expected);
  Reset();
  var actual = Deserialize<CultureInfo>();
  Assert.Equal(expected, actual);
}