Update src/System.Linq.Dynamic.Core/DynamicGetMemberBinder.cs

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: StefH

src/System.Linq.Dynamic.Core/DynamicGetMemberBinder.cs

@@ -15,8 +15,14 @@ namespace System.Linq.Dynamic.Core;
 internal class DynamicGetMemberBinder : GetMemberBinder
 {
     private static readonly MethodInfo DynamicGetMemberMethod = typeof(DynamicGetMemberBinder).GetMethod(nameof(GetDynamicMember))!;
+    
+    // The _metaObjectCache uses a Tuple<Type, string, bool> as the key to cache DynamicMetaObject instances.
+    // The key components are:
+    // - Type: The LimitType of the target object, ensuring type-specific caching.
+    // - string: The member name being accessed.
+    // - bool: The IgnoreCase flag, indicating whether the member name comparison is case-insensitive.
+    // This strategy ensures that the cache correctly handles different types, member names, and case-sensitivity settings.
     private readonly ConcurrentDictionary<Tuple<Type, string, bool>, DynamicMetaObject> _metaObjectCache = new();
-
     internal DynamicGetMemberBinder(string name, ParsingConfig? config) : base(name, config?.IsCaseSensitive != true)
     {
     }