{{ size={ _size() }}} $T2 storage_.data_.allocated.allocated_capacity $T2 _size() _is_allocated() storage_.metadata_ _size() _inlined_data()[$i] _size() _allocated_data()[$i] empty {{ size={size_} }} size_ capacity_ size_ slots_[nslot] nslot++ {{ {value.first}:{value.second} }} value.first value.second