@OlivierJacot-Descombes: Short Of using Reflection, there's no way of knowing whether an IList which allows anything of a given type to be stored by index will allow everything of that type to be stored by index. I noticed that if I use IEnumerable, when I debug and inspect "baskın", which https://cobjectkullanm18150.blogzet.com/c-ienumerable-temel-Özellikleri-herkes-İçin-eğlenceli-olabilir-42762495