Fix casing CollectionType

MediaBrowser.Model/Entities/JsonLowerCaseConverter.cs

@@ -0,0 +1,29 @@
+#nullable disable
+// THIS IS A HACK
+// TODO: @bond Move to separate project
+
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace MediaBrowser.Model.Entities
+{
+    /// <summary>
+    /// Converts an object to a lowercase string.
+    /// </summary>
+    /// <typeparam name="T">The object type.</typeparam>
+    public class JsonLowerCaseConverter<T> : JsonConverter<T>
+    {
+        /// <inheritdoc />
+        public override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            return JsonSerializer.Deserialize<T>(ref reader, options);
+        }
+
+        /// <inheritdoc />
+        public override void Write(Utf8JsonWriter writer, T value, JsonSerializerOptions options)
+        {
+            writer.WriteStringValue(value?.ToString().ToLowerInvariant());
+        }
+    }
+}

MediaBrowser.Model/Entities/VirtualFolderInfo.cs

@@ -2,6 +2,7 @@
 #pragma warning disable CS1591
 
 using System;
+using System.Text.Json.Serialization;
 using MediaBrowser.Model.Configuration;
 
 namespace MediaBrowser.Model.Entities
@@ -35,6 +36,7 @@ namespace MediaBrowser.Model.Entities
         /// Gets or sets the type of the collection.
         /// </summary>
         /// <value>The type of the collection.</value>
+        [JsonConverter(typeof(JsonLowerCaseConverter<CollectionTypeOptions?>))]
         public CollectionTypeOptions? CollectionType { get; set; }
 
         public LibraryOptions LibraryOptions { get; set; }