Jacob Geiger

FWIW, I think the "right" solution to this problem is to - make sure developers know of the existence of `GaxError.cause` - Intervene at the handwritten google-cloud-python level in cases...

Summary of offline discussion with @lukesneeringer: - We should not wrap *all* exceptions without any knowledge of what we're wrapping here. - We should aim to preserve the original design...

Field sizes should be computed through [ByteSize](https://github.com/google/protobuf/blob/d5fb408ddc281ffcadeb08699e65bb694656d0bd/python/google/protobuf/internal/python_message.py#L1035)

Actually, re-open because we still may wish to evaluate a future renaming. But because it is no longer exposed to users, downgrade priority to P3.