Unity Json.Net: Error setting value - unity3d

Question

I'm trying to create a convenient serialized reference to asset objects. It serialized correctly, but deserialization fails with exception
"Error setting value to 'textAssetRef' on 'TestData'."
I've prepared a small test component for Unity to illustrate this:
using System;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using UnityEditor;
using UnityEngine;
public class Test : MonoBehaviour
{
public TestData testData;
public void Awake()
{
try
{
var sData = JsonConvert.SerializeObject(testData, Formatting.Indented);
UnityEngine.Debug.Log(sData);
testData = JsonConvert.DeserializeObject<TestData>(sData);
UnityEngine.Debug.Log("Done.");
}
catch (Exception x)
{
UnityEngine.Debug.LogError(x.Message);
}
}
}
[Serializable]
public class TestData
{
public TextAssetRef textAssetRef;
}
[Serializable]
[JsonConverter(typeof(Serialization))]
public class TextAssetRef : ObjectRef<TextAsset>
{
public TextAssetRef() { }
public TextAssetRef(TextAssetRef other) : base(other) { }
public TextAssetRef(TextAsset ta) : base(ta) { }
}
[Serializable]
public class ObjectRef<T> where T : UnityEngine.Object
{
public T obj;
public ObjectRef() { }
public ObjectRef(ObjectRef<T> other) { obj = other.obj; }
public ObjectRef(T obj) { this.obj = obj; }
public class Serialization : JsonConverter
{
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
var objRef = (ObjectRef<T>)value;
var jObject = new JObject { { "path", AssetDatabase.GetAssetPath(objRef.obj) } };
serializer.Serialize(writer, jObject);
}
public override bool CanConvert(Type objectType) { return objectType == typeof(ObjectRef<T>); }
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
var jObject = JObject.Load(reader);
var assetPath = jObject.GetValue("path").Value<string>();
return new ObjectRef<T> { obj = AssetDatabase.LoadAssetAtPath<T>(assetPath) };
}
}
}
To reproduce the error just create a new project with JSON.Net asset package in Unity, create empty object in scene, put this Test component on it and press Play.
What am I to do to get it deserialized correctly?