In need for CommonOriginalType

["Nordlöw" via Digitalmars-d-learn]

>   is(CommonType!(OriginalType!T1, OriginalType!T2)
>
> ... ?

I need it to be variadic.

I cracked it:

import std.typetuple: staticMap;
import std.traits: CommonType, OriginalType;
alias CommonOriginalType(T...) = 
CommonType!(staticMap!(OriginalType, T));

/per