QDebug should not escape printable non-US-ASCII characters

Since version 5.5 if you try this line:
qDebug() << QString("проверка кириллицы");
you get this instead of proper text:
"\u043F\u0440\u043E\u0432\u0435\u0440\u043A\u0430 043A\u0438\u0440\u0438\u043B\u043B\u0438\u0446\u044B"

at the same time this works as intended:
qDebug() << "проверка кириллицы";