U4-8551 - import NuCache code

src/Umbraco.Core/Serialization/ForceInt32Converter.cs

@@ -0,0 +1,28 @@
+using System;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace Umbraco.Core.Serialization
+{
+    internal class ForceInt32Converter : JsonConverter
+    {
+        public override bool CanConvert(Type objectType)
+        {
+            return objectType == typeof (object) || objectType == typeof (int);
+        }
+
+        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        {
+            var jsonValue = serializer.Deserialize<JValue>(reader);
+
+            return jsonValue.Type == JTokenType.Integer
+                ? jsonValue.Value<int>()
+                : serializer.Deserialize(reader);
+        }
+
+        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}