In sync_tail.h:

static AtomicInt32 replBatchLimitOperations;

This should instead be an AtomicWord<size_t>, because we use it to initialize variables of size_t type (which is unsigned), and because it should match the type of the variable with the same name found in data_replicator.h. (We should probably change replBatchLimitOperations in data_replicator.h to be std::size_t instead of std::uint32_t as well)