private BsonSerializer(FSP.Json.BsonSerializer bs)
     : base(bs)
 {
     _bs = bs;
 }
 private JsonSerializer(FSP.Json.JsonSerializer js)
     : base(js)
 {
     _js = js;
 }
 private XmlSerializer(FSP.XmlSerializer xs)
     : base(xs)
 {
     _xs = xs;
 }
 private BinarySerializer(FSP.BinarySerializer serializer)
     : base(serializer)
 {
     _bs = serializer;
 }