Why is Phobos `Flag` so overthought ?

[user1234]

I think this just works:

```d
enum Flag : bool
{
     no,
     yes
}

alias AllowVancancy = Flag; // example usage
```

Also this is completion friendly whereas Phobos version does not 
permit DCD completion as it's based on opDispatch.

Compare to phobos version:

```d
template Flag(string name) {
     enum Flag : bool
     {
         no = false,
         yes = true
     }
}

struct Yes
{
     template opDispatch(string name)
     {
         enum opDispatch = Flag!name.yes;
     }
}

struct No
{
     template opDispatch(string name)
     {
         enum opDispatch = Flag!name.no;
     }
}
```

must be a reason but I cant find it RN ;)