could use `cls.decode_mongo_encoded_section_names`, since referring to this class is more important than referring to the class name (in case the name changes in the future).  But that method doesn't refer to cls vars, or other class methods, is there a reason why it is a class method and not a module function (outside of the class)?  Also, for readability maybe use a local var for the argument,

```python
joined_export = dict_to_joined_export(d, index, indices, survey_name)
output = decode_mongo_encoded_section_names(joined_export)
```