Patch fixing concurrency bug in fastJSON 2.0.5

JSON.patch

diff --git a/fastJSON/JSON.cs b/fastJSON/JSON.cs
index d2f651e..0915fc1 100644
--- a/fastJSON/JSON.cs
+++ b/fastJSON/JSON.cs
@@ -64,7 +64,17 @@ namespace fastJSON

    public sealed class JSON
    {
-        public readonly static JSON Instance = new JSON();
+        [ThreadStatic]
+        private static JSON _instance;
+
+        public static JSON Instance
+        {
+            get
+            {
+                if (_instance == null) _instance = new JSON();
+                return _instance;
+            }
+        }

        private JSON()
        {

If someone wants to use this, please also consider making JSON.Parameters a thread safe static, See my fastJSON fork on github for an example.