Incorrect type returned from falsey 0.0

[AkhilGNair]

Hi!

Thank you for the package :) it's really useful.

I think your test_nullable_types_gen test fails if run with sufficient random data:

====================== test session starts ======================
platform linux -- Python 3.10.5, pytest-7.1.2, pluggy-1.0.0
rootdir: ...
plugins: Faker-13.15.1
collected 63 items                                              

src/tests/test_cli.py .                                   [  1%]
src/tests/test_default_fake.py .....................      [ 34%]
src/tests/test_model_gen.py ............                  [ 53%]
src/tests/test_nullable_types_gen.py .F.......            [ 68%]
src/tests/test_parser.py ...............                  [ 92%]
src/tests/test_utils.py .....                             [100%]

=========================== FAILURES ============================
_______________________ test_int_null_gen _______________________

TestData = PosixPath('...')

    def test_int_null_gen(TestData):
        with open(TestData / f"type-list-null.json", "r") as file:
            schema = json.load(file)
        p = JSF(schema["int"])
    
        actual = [p.generate() for _ in range(100000)]
>       assert all(type(each) in [type(None), int] for each in actual)
E       assert False
E        +  where False = all(<generator object test_int_null_gen.<locals>.<genexpr> at 0x7f60271a3990>)

src/tests/test_nullable_types_gen.py:22: AssertionError
==================== short test summary info ====================
FAILED src/tests/test_nullable_types_gen.py::test_int_null_gen
================= 1 failed, 62 passed in 3.05s ==================

For example, here I have changed the number of generated values from 100 to 100,000 to produce an error.

In this case in particular, it is because occasionally the float 0.0 is generated, which is falsey and so gets passed through as a float. Making the check explicitly for is not None fixes this.

Unfortunately, I can't come up with a better way to permanently fix the test...
If you can suggest anything, I am happy to add.

Thanks!
Akhil