kLogPageSize       26 courgette/third_party/paged_array.h     kPageSize = 1 << kLogPageSize
kLogPageSize       35 courgette/third_party/paged_array.h     size_t page = i >> kLogPageSize;
kLogPageSize       46 courgette/third_party/paged_array.h     size_t pages_needed = (size + kPageSize - 1) >> kLogPageSize;