Make `IsValueObject` check customizable.

framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Entities/EntityHelper.cs

@@ -123,10 +123,17 @@ public static class EntityHelper
         return typeof(IEntity).IsAssignableFrom(type);
     }
 
+    public static Func<Type, bool> IsValueObjectPredicate = type => typeof(ValueObject).IsAssignableFrom(type);
+
     public static bool IsValueObject([NotNull] Type type)
     {
         Check.NotNull(type, nameof(type));
-        return typeof(ValueObject).IsAssignableFrom(type);
+        return IsValueObjectPredicate(type);
+    }
+
+    public static bool IsValueObject(object obj)
+    {
+        return obj != null && IsValueObject(obj.GetType());
     }
 
     public static void CheckEntity([NotNull] Type type)

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/EntityHistory/EntityHistoryHelper.cs

@@ -93,7 +93,7 @@ public class EntityHistoryHelper : IEntityHistoryHelper, ITransientDependency
         }
 
         var entityId = GetEntityId(entity);
-        if (entityId == null && changeType != EntityChangeType.Created && !(entity is ValueObject))
+        if (entityId == null && changeType != EntityChangeType.Created && !EntityHelper.IsValueObject(entity))
         {
             return null;
         }
@@ -151,7 +151,7 @@ public class EntityHistoryHelper : IEntityHistoryHelper, ITransientDependency
             return keys.JoinAsString(",");
         }
 
-        if (entityAsObj is ValueObject)
+        if (EntityHelper.IsValueObject(entityAsObj))
         {
             return null;
         }