Missing support for prefixItems

[dionhaefner]

Reproducer:

from typing import Tuple
import pydantic
import jsf

class MyModel(pydantic.BaseModel):
    some_attr: Tuple[int, int]

schema = MyModel.model_json_schema()
print(schema)
faker = jsf.JSF(schema)
print(faker.generate())

Output:

{'properties': {'some_attr': {'maxItems': 2, 'minItems': 2, 'prefixItems': [{'type': 'integer'}, {'type': 'integer'}], 'title': 'Some Attr', 'type': 'array'}}, 'required': ['some_attr'], 'title': 'MyModel', 'type': 'object'}
Traceback (most recent call last):
  File "/Users/dion/.virtualenvs/science/lib/python3.10/site-packages/jsf/schema_types/object.py", line 45, in generate
    return super().generate(context)
  File "/Users/dion/.virtualenvs/science/lib/python3.10/site-packages/jsf/schema_types/base.py", line 66, in generate
    raise ProviderNotSetException()
jsf.schema_types.base.ProviderNotSetException

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/dion/codes/tesseract/jsf_bug.py", line 12, in <module>
    print(faker.generate())
  File "/Users/dion/.virtualenvs/science/lib/python3.10/site-packages/jsf/parser.py", line 355, in generate
    return self.root.generate(context=context)
  File "/Users/dion/.virtualenvs/science/lib/python3.10/site-packages/jsf/schema_types/object.py", line 47, in generate
    explicit_properties = {
  File "/Users/dion/.virtualenvs/science/lib/python3.10/site-packages/jsf/schema_types/object.py", line 50, in <dictcomp>
    if self.should_keep(o.name, context)
AttributeError: 'NoneType' object has no attribute 'name'

[dionhaefner]

Actually, this is triggered whenever an array is encountered that doesn't have a defined type via items.