I needed to override the sanitize method inherited from the Base class, because it was transforming nested hashes inside of the CustomData resource.

E.G.
```
custom_data = { student : { grad_school: { grad_school_name: "Some Grad School"} } }
```
When i would fetch 
```ruby
custom_data["student"]
```
i would expect to get back:
```ruby
{ grad_school: { grad_school_name: "Some Grad School"} } 
```

instead of 

```ruby
{ gradSchool: { gradSchoolName: "Some Grad School"} } 
```

Basically because of the whole camelCase to snakecase transformations. CustomData resource is special here because of it's features to be schemaless.