`MutationBatcher` allows users to [set values](https://github.com/googleapis/google-cloud-cpp/blob/e49eefac8a856d52e66bda996c07f4fcb06374d4/google/cloud/bigtable/mutation_batcher.h#L63-L67) above the maximum allowed [mutations per batch](https://github.com/googleapis/google-cloud-cpp/blob/main/google/cloud/bigtable/mutation_batcher.cc#L26) and [outstanding mutations](https://github.com/googleapis/google-cloud-cpp/blob/feda70036bd9847a190249fd0fbef271300045c3/google/cloud/bigtable/mutation_batcher.cc#L28). We should never let these values exceed the Bigtable imposed limits.
MutationBatcherallows users to set values above the maximum allowed mutations per batch and outstanding mutations. We should never let these values exceed the Bigtable imposed limits.