mongoengine DecimalField incorrect validation

test.py

import mongoengine
import unittest


class Test(mongoengine.Document):
    float = mongoengine.FloatField()
    decimal = mongoengine.DecimalField()


class ValidateTestCase(unittest.TestCase):
    def test_float(self):
        doc = Test(float='something invalid')
        self.assertRaises(mongoengine.ValidationError, doc.validate)

    def test_decimal(self):
        doc = Test(decimal='something invalid')
        self.assertRaises(mongoengine.ValidationError, doc.validate)


if __name__ == '__main__':
    unittest.main()