Use UnityEngine.JsonUtility.ToJson(value) instead of SerializeString(value.ToString()) to serialize 'other' values.

[sotirosn]

Improved MiniJson.Json.Serialize to utilize UnityEngine.JsonUtility.ToJson() to serialize System.Serializable classes/structs, rather than serializing the string of the object's ToString(). This allows for much more robust serialization. For example you can do this:

[System.Serializable]
public struct MyData {
   public string id;
   public long timestamp;
   public string message;
}

MyData[] data = GetSomeData();
Json.Serialize(data);  

outputs: [{"id":"...","timestamp":1234,"message":"..."},{"id":"...","timestamp":1234,"message":"..."}]
instead of: ["MyData","MyData"]

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[sotirosn]

I suggest changing 1 line of code. I'm not signing anything. Its your job to maintain the project so you can either pull or not.