sumtype 0.3.0

[Paul Backus]

On Monday, 7 May 2018 at 19:28:16 UTC, Sönke Ludwig wrote:
> Another similar project: http://taggedalgebraic.dub.pm/

There's also tagged_union and minivariant on dub, that I've 
found. I'm definitely far from the first person to be 
dissatisfied with `Algebraic`, or to try my hand at writing a 
replacement.

The main difference between all of those and sumtype is that 
sumtype has pattern matching. Personally, I consider that an 
essential feature--arguably *the* essential feature--which is why 
I went ahead with Yet Another implementation anyway.