There is a runtime (not C#) feature that has been added that is relevant to the article: ref fields in structs. Before these, only certain runtime-blessed types

There is a runtime (not C#) feature that has been added that is relevant to the article: ref fields in structs. Before these, only certain runtime-blessed types like Span<T> could contain refs directly. In case anyone is interested, here is the spec about refs in structs and other lifetime features mentioned in the article: https://github.com/dotnet/csharplang/blob/main/proposals/csharp-11.0/low-level-struct-improvements.md https://github.com/dotnet/csharplang/blob/main/proposals/csh... And here is the big list of ways .NET differs from the publish ECMA spec. Some of these differences represent new runtime features. https://github.com/dotnet/runtime/blob/main/docs/design/specs/Ecma-335-Augments.md https://github.com/dotnet/runtime/blob/main/docs/design/spec...