Added the possibility to have custom parsers

src/Mixpanel/Mixpanel/MessageBuilders/Track/TrackMessageBuilder.cs

@@ -71,7 +71,17 @@ public static MessageBuildResult Build(
                 string formattedPropertyName = pair.Key;
                 ObjectProperty objectProperty = pair.Value;
 
-                ValueParseResult result = GenericPropertyParser.Parse(objectProperty.Value, allowCollections: true);
+                ValueParseResult result;
+
+                if (config.CustomPropertiesParser != null)
+                {
+                    result = config.CustomPropertiesParser(objectProperty.Value, true);
+                }
+                else
+                {
+                    result = GenericPropertyParser.Parse(objectProperty.Value, allowCollections: true);
+                }
+
                 if (!result.Success)
                 {
                     continue;

src/Mixpanel/Mixpanel/MixpanelConfig.cs

@@ -1,4 +1,5 @@
-using System;
+using Mixpanel.Parsers;
+using System;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -49,6 +50,11 @@ public class MixpanelConfig
         /// </summary>
         public static MixpanelConfig Global { get; }
 
+        /// <summary>
+        /// With this property you can create your own Parser to handle custom properties.
+        /// </summary>
+        public Func<object, bool, ValueParseResult> CustomPropertiesParser { get; set; }
+
         static MixpanelConfig()
         {
             Global = new MixpanelConfig();

src/Mixpanel/Mixpanel/Parsers/ValueParseResult.cs

@@ -1,6 +1,6 @@
 namespace Mixpanel.Parsers
 {
-    internal sealed class ValueParseResult
+    public sealed class ValueParseResult
     {
         public bool Success { get; }
         public object Value { get; }