docs: def contribute_to_class(self, cls, name, **kwargs):
          """
          Add a decrypted field proxy to the model.
  
          Add to the field model an `EncryptedProxyField` to get the decrypted
          values of the field.
  
          The decrypted value can be accessed using the field's name attribute on
          the model instance.
          """
          super(PGPMixin, self).contribute_to_class(cls, name, **kwargs)
          setattr(cls, self.name, self.descriptor_class(field=self))