Take default value when value is None

I would like to specify fields that will use the default value if their value is `None` (even if they are not missing), something similar to the following field declaration will match perfectly to my case:
```python
fields.Pluck(MySchema, 'x', default={'x': 0}, take_default_on=[None])
```

Is there any way doing this without `@post_dump` or overriding `get_attribute` method?