internal T ParseStringEnum <T>(string s) where T : StringEnum <T>, new()
{
var e = StringEnum <T> .ToStringEnum(s);
if (e == null)
{
e = StringEnum <T> .Add(s);
output(new ResponseWarning($"ReadStringEnum<{typeof(T).Name}>('{e}') added new value."));
}
return(e);
}
