After upgrading to Version 1.4.34 I can no longer serialize simple enums, it works with the previous version 1.3.13 This code: ```fsharp type Enum = | Case1 | Case2 type Record = { Field: Enum } let options = JsonFSharpOptions .Default() .WithUnionUnwrapFieldlessTags() .ToJsonSerializerOptions() let json = JsonSerializer.Serialize({ Field = Enum.Case2 }, options) ``` Creates the following json ```json {"Field":"Case":"Case2"} ```