Optional and NotNull version 0.5.0 - swift optional like and scala option like

[jmh530]

On Monday, 20 August 2018 at 19:06:36 UTC, Seb wrote:
> [snip]
> That looks pretty cool!
> I added optional to run.dlang.io (e.g. 
> https://run.dlang.io/is/912kVG) and the project tester 
> (https://github.com/dlang/ci/pull/288).

It's interesting that both sumtype and optional have match 
templates. Maybe scope to combine these projects?