- Fix ConversationItemTruncateRequest.ContentIndex default serialization

Author: StephenHodgson

OpenAI-DotNet/OpenAI-DotNet.csproj

@@ -34,6 +34,7 @@ More context [on Roger Pincombe's blog](https://rogerpincombe.com/openai-dotnet-
 Version 8.8.2
 - Add file_url for responses api
 - Added NoiseReductionSettings for RealtimeConfiguration
+- Fix ConversationItemTruncateRequest.ContentIndex default serialization
 Version 8.8.1
 - Updated realtime audio transcription settings properties
 Version 8.8.0

OpenAI-DotNet/Realtime/ConversationItemTruncateRequest.cs

@@ -45,6 +45,7 @@ public ConversationItemTruncateRequest(string itemId, int contentIndex, int audi
         /// </summary>
         [JsonInclude]
         [JsonPropertyName("content_index")]
+        [JsonIgnore(Condition = JsonIgnoreCondition.Never)]
         public int ContentIndex { get; private set; }
 
         /// <summary>