redundant args enforced in validate methods?

[jps-ob]

For model level validators, we have to take 3 params as enforced by underneath functions

In [210]: class A(Model):
     ...:     id=StringType()
     ...:     names=ListType(StringType)
     ...:     black_list=ListType(StringType)
     ...:
     ...:
     ...:     def validate_names(self, validated, new_data):
     ...:         print(f"New Data: {new_data}")
     ...:         print(f"Validated: {validated}")
     ...:         print(f"Self: {dict(self)}")
     ...:         if any([n in validated["black_list"] for n in new_data]):
     ...:             raise ValidationError("Blacklisted name found")

In [211]: a=A();a.id=1;a.names=["kk"];a.black_list=["jj"];a.validate()
New Data: ['kk']
Validated: {'id': '1', 'names': ['kk'], 'black_list': ['jj']}
Self: {'id': 1, 'names': ['kk'], 'black_list': ['jj']}

If those validated and new_data fields are not enforced, we could something like this

In [212]: class A(Model):
     ...:     id=StringType()
     ...:     names=ListType(StringType)
     ...:     black_list=ListType(StringType)
     ...:
     ...:
     ...:     def validate_names(self):
     ...:         print(f"Self: {dict(self)}")
     ...:         if any([n in self.black_list for n in self.names]):
     ...:             raise ValidationError("Blacklisted name found")

Unfortunately, it throws up the error as data(aka validated above)/ value (aka new_data above) are enforced by schema._validator_functions

In [213]: a=A();a.id=1;a.names=["kk"];a.black_list=["jj"];a.validate()
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-213-7639fd4c17da> in <module>
----> 1 a=A();a.id=1;a.names=["kk"];a.black_list=["jj"];a.validate()

~schematics/models.py in validate(self, partial, convert, app_data, **kwargs)
    256         try:
    257             data = self._convert(validate=True,
--> 258                 partial=partial, convert=convert, app_data=app_data, **kwargs)
    259             self._data.valid = data
    260         except DataError as e:

~schematics/models.py in _convert(self, raw_data, context, **kwargs)
    297         should_validate = getattr(context, 'validate', kwargs.get('validate', False))
    298         func = validate if should_validate else convert
--> 299         return func(self._schema, self, raw_data=raw_data, oo=True, context=context, **kwargs)
    300
    301     def export(self, field_converter=None, role=None, app_data=None, **kwargs):

~schematics/validate.py in validate(schema, mutable, raw_data, trusted_data, partial, strict, convert, context, **kwargs)
     62         data = exc.partial_data
     63
---> 64     errors.update(_validate_model(schema, mutable, data, context))
     65
     66     if errors:

~schematics/validate.py in _validate_model(schema, mutable, data, context)
     93     for field_name, field, value in atoms(schema, data, filter=has_validator):
     94         try:
---> 95             schema._validator_functions[field_name](mutable, data, value, context)
     96         except (FieldError, DataError) as exc:
     97             serialized_field_name = field.serialized_name or field_name

~schematics/validate.py in newfunc(*args, **kwargs)
    126             if not kwargs or kwargs.pop('context', 0) is 0:
    127                 args = args[:-1]
--> 128             return func(*args, **kwargs)
    129         return newfunc
    130     return func

TypeError: validate_names() takes 1 positional argument but 3 were given

Was this intentional ?