The so-called uniform initialization feature, or brace initialization, or sometimes list initialization, should be added to the permitted feature set.

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2672.htm

https://en.cppreference.com/w/cpp/language/initialization
https://en.cppreference.com/w/cpp/language/value_initialization
https://en.cppreference.com/w/cpp/language/direct_initialization
https://en.cppreference.com/w/cpp/language/list_initialization
https://en.cppreference.com/w/cpp/language/aggregate_initialization