public void WriteNullableStruct <T>(T?value) where T : struct
 {
     if (WriteIsNotNull(value))
     {
         DynamicStructTypeInfo <T> .Save(value.Value, this);
     }
 }
 //todo, xml note here about no strict struct req?
 public void WriteStruct <T>(T value)
 {
     // No null check, no ref comparison, and no dynamic subtype resolution:
     DynamicStructTypeInfo <T> .Save(value, this);
 }