Why is Phobos `Flag` so overthought ?

[user1234 via Digitalmars-d-learn]

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 ;)