@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 "yığın", which https://cobjectkullanm18406.ka-blogs.com/81341037/c-ienumerable-nerelerde-kullanılıyor-Üzerinde-buzz-söylenti