Former-commit-id: 6f1a0df5d0bc69072489ccd3ce70455de4130c75
Former-commit-id: b5145a1a0ad8031001927c29c49e0f1faae2d7af
It's like std::bitset with a dynamic size Former-commit-id: 704352d954c88e9cf829b41448d7761f89f59786