OT: (C#) Type Unions for C#

[ryuukk_]

Some people over here like to take C# as inspiration for new DIPs

Well, tagged union is coming to C#, let's resurrect that old DIP 
and go submit a PR

Don't become a relic of the past, move forward

https://github.com/dotnet/csharplang/blob/main/proposals/TypeUnions.md

D should be leading, there is no reason for D to remain a relic 
of the past, no industry rely on D, yet they rely on C#, and yet 
C# moves forward!