Comments added.

src/SimpleInjector/Internals/ReflectionExtensions.cs

@@ -40,6 +40,8 @@ public static Type[] GetGenericArguments(this Type type) => type.GetTypeInfo().I
         public static bool IsGenericParameter(this Type type) => type.GetTypeInfo().IsGenericParameter;
         public static GenericParameterAttributes GetGenericParameterAttributes(this Type type) => type.GetTypeInfo().GenericParameterAttributes;
         public static Assembly GetAssembly(this Type type) => type.GetTypeInfo().Assembly;
+
+        /// <summary>WARNING: Only returns properties of the given type; NOT its base types.</summary>
         public static PropertyInfo[] GetProperties(this Type type) => type.GetTypeInfo().DeclaredProperties.ToArray();
         public static Guid GetGuid(this Type type) => type.GetTypeInfo().GUID;
 

src/SimpleInjector/Types.cs

@@ -225,6 +225,9 @@ internal static IEnumerable<Type> GetTypeBaseTypesAndInterfaces(this Type type)
             return thisType.Concat(type.GetBaseTypesAndInterfaces());
         }
 
+        // TODO: There is some weird inconsistency in this method. In case supplied type derives directly
+        // from System.Object, typeof(object) is returned. But if the supplid type has a different base type,
+        // the result will not include typeof(object).
         private static IEnumerable<Type> GetBaseTypes(this Type type)
         {
             Type? baseType = type.BaseType() ?? (type != typeof(object) ? typeof(object) : null);