Dont serialize delegates

imm/Imm.cs

@@ -4,6 +4,7 @@ using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 
 namespace imm;
 
@@ -51,6 +52,7 @@ public interface Obj<T> : Obj where T : Obj<T>
     /// <summary>
     /// Gets the change delegate associated with this object.
     /// </summary>
+    [JsonIgnore]
     ChangeDelegate<T> OnChange { get; set; }
 
     /// <summary>