I was incorrect with description of the problem. The problem is that
there is no simple way to distinct types and symbols if symbols are
private. Because private symbol is not accessible you can not get any
info on it, including is it type or symbol or value. And you can not get
protection for types and values, because they have no protection at all.
So you can not get protection for types and values and can not check if
alias is type, value and symbol because it is private/protected. Vicious
circle.
Specific case https://run.dlang.io/is/CAoxXO
Honestly, if `isType` can recognize private members the problem would be
solved. But I think `isSymbol` and `isValue` (working with private
members) will make situation more consistent.
Current workaround with fields is using FieldNameTuple. But I fails to
work around private enums.
