How to avoid inout type constructor with Optional type wrapper undoing string type

[aliak]

On Monday, 23 July 2018 at 19:31:42 UTC, aliak wrote:
> Ok, now I'm totally confused. Defining an extra type 
> constructor makes everything work. I.e add a const one to the 
> inout one:
>
> auto defined(T)(const auto ref T value) {
>     return W!T(value);
> }
>
> and everything works!
>
> Can anyone say why that is?

Boh, seems other problems crop up now as doing this:

auto a = defined!(int*)(null);

produces error:

onlineapp.d(13): Error: inout constructor 
onlineapp.W!(int*).W.__ctor!(int*).this creates const object, not 
mutable
onlineapp.d(30): Error: template instance 
`onlineapp.defined!(int*)` error instantiating

https://run.dlang.io/is/BWYxA8