The announcement of the future addition is related to Extension types which in C# 13 will be expanded by providing additional methods, properties, and members to underlying types.

Developers should have a basic proficiency of a language's data types. In this article, Irina Medvinskaya presents an overview of two types of predefined C# variables: value types and reference types.

Forthcoming update to the C# language extends params parameter support and introduces a new type that supplies extension members for an underlying type.