Going forward, the .NET team is using https://github.com/dotnet/runtime to develop the code and issues formerly in this repository.
Please see the following for more context:
Provides the HashCode type for .NET Standard 2.0. This package is not required starting with .NET Standard 2.1 and .NET Core 3.0. Commonly Used Types: System.HashCode When using NuGet 3.x this package requires at least version 3.4.
Install-Package Microsoft.Bcl.HashCode -Version 1.1.1
Going forward, the .NET team is using https://github.com/dotnet/runtime to develop the code and issues formerly in this repository.
Please see the following for more context: