Cleanup

Author: artemiusgreat

Core/Core/Extensions/Grain.cs

@@ -21,7 +21,7 @@ public static string GetDescriptor(this IAddressable grain)
     /// <param name="name"></param>
     public static string GetDescriptor(this IAddressable grain, string name)
     {
-      return $"{grain.GetPrimaryKeyString()}:{name}";
+      return string.Concat(grain.GetPrimaryKeyString(), ":", name);
     }
   }
 }