From TODO: ``` python # TODO(jjg): Should we raise a ValueError here? ``` See [`datastore.helpers.get_value_from_protobuf`](https://github.com/GoogleCloudPlatform/gcloud-python/blob/1f2aaf3606802f4f02eeb30e22e1082ef7f4594e/gcloud/datastore/helpers.py#L100) for relevant code and #146 for some context. `git blame` output ``` dec0e7c6 (JJ Geewax 2014-01-28 15:15:40 -0500 100) # TODO(jjg): Should we raise a ValueError here? ```