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.

C# 12 also extends alias support to any type. Microsoft explained that developers can use the using alias directive to alias any type, not just named types. Semantic aliases can be created for ...