fix(extra): Field examples attr raises ValueError when give int

[Athroniaeth]

I use pydantic models and the examples attribute of the Field descriptor in my structured output projects whenever possible. I noticed in the Mistral documentation that there was a function for obtaining a schema, and I wanted to test it to compare the one I had made with yours, and I noticed that I had a strange error.

It seems that the int was omitted from what I assume to be the list of primary types in the rec_strict_json_schema function.

Here's how to reproduce the error:

from mistralai.extra import response_format_from_pydantic_model
from pydantic import BaseModel, Field


class Pass1(BaseModel):
    string: int = Field(...)
    boolean: bool = Field(...)
    number: int = Field(...)

class Pass2(BaseModel):
    string: int = Field(..., examples=["example1", "example2"])
    boolean: bool = Field(..., examples=[True, False])
    number: int = Field(...)


class Failed(BaseModel):
    string: int = Field(..., examples=["example1", "example2"])
    boolean: bool = Field(..., examples=[True, False])
    number: int = Field(..., examples=[42, 7, 100])


print(response_format_from_pydantic_model(Pass1))
print(response_format_from_pydantic_model(Pass2))
print(response_format_from_pydantic_model(Failed))

The result :

uv run /home/.../PycharmProjects/.../.venv/bin/python /home/.../PycharmProjects/.../benchmarks/format.py 
type='json_schema' json_schema=JSONSchema(name='Pass1', schema_definition={'properties': {'string': {'title': 'String', 'type': 'integer'}, 'boolean': {'title': 'Boolean', 'type': 'boolean'}, 'number': {'title': 'Number', 'type': 'integer'}}, 'required': ['string', 'boolean', 'number'], 'title': 'Pass1', 'type': 'object', 'additionalProperties': False}, description=Unset(), strict=True)
type='json_schema' json_schema=JSONSchema(name='Pass2', schema_definition={'properties': {'string': {'examples': ['example1', 'example2'], 'title': 'String', 'type': 'integer'}, 'boolean': {'examples': [True, False], 'title': 'Boolean', 'type': 'boolean'}, 'number': {'title': 'Number', 'type': 'integer'}}, 'required': ['string', 'boolean', 'number'], 'title': 'Pass2', 'type': 'object', 'additionalProperties': False}, description=Unset(), strict=True)
Traceback (most recent call last):
  File "/home/.../PycharmProjects/.../benchmarks/format.py", line 24, in <module>
    print(response_format_from_pydantic_model(Failed))
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/.../PycharmProjects/.../.venv/lib/python3.12/site-packages/mistralai/extra/utils/response_format.py", line 13, in response_format_from_pydantic_model
    model_schema = rec_strict_json_schema(model.model_json_schema())
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/.../PycharmProjects/.../.venv/lib/python3.12/site-packages/mistralai/extra/utils/_pydantic_helper.py", line 15, in rec_strict_json_schema
    schema_node[key] = rec_strict_json_schema(value)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/.../PycharmProjects/.../.venv/lib/python3.12/site-packages/mistralai/extra/utils/_pydantic_helper.py", line 15, in rec_strict_json_schema
    schema_node[key] = rec_strict_json_schema(value)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/.../PycharmProjects/.../.venv/lib/python3.12/site-packages/mistralai/extra/utils/_pydantic_helper.py", line 15, in rec_strict_json_schema
    schema_node[key] = rec_strict_json_schema(value)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/.../PycharmProjects/.../.venv/lib/python3.12/site-packages/mistralai/extra/utils/_pydantic_helper.py", line 18, in rec_strict_json_schema
    schema_node[i] = rec_strict_json_schema(value)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/.../PycharmProjects/.../.venv/lib/python3.12/site-packages/mistralai/extra/utils/_pydantic_helper.py", line 20, in rec_strict_json_schema
    raise ValueError(f"Unexpected type: {schema_node}")
ValueError: Unexpected type: 42

Process finished with exit code 1

The result after patchfix :

uv run /home/.../PycharmProjects/.../.venv/bin/python /home/.../PycharmProjects/.../benchmarks/format.py 
type='json_schema' json_schema=JSONSchema(name='Pass1', schema_definition={'properties': {'string': {'title': 'String', 'type': 'integer'}, 'boolean': {'title': 'Boolean', 'type': 'boolean'}, 'number': {'title': 'Number', 'type': 'integer'}}, 'required': ['string', 'boolean', 'number'], 'title': 'Pass1', 'type': 'object', 'additionalProperties': False}, description=Unset(), strict=True)
type='json_schema' json_schema=JSONSchema(name='Pass2', schema_definition={'properties': {'string': {'examples': ['example1', 'example2'], 'title': 'String', 'type': 'integer'}, 'boolean': {'examples': [True, False], 'title': 'Boolean', 'type': 'boolean'}, 'number': {'title': 'Number', 'type': 'integer'}}, 'required': ['string', 'boolean', 'number'], 'title': 'Pass2', 'type': 'object', 'additionalProperties': False}, description=Unset(), strict=True)
type='json_schema' json_schema=JSONSchema(name='Failed', schema_definition={'properties': {'string': {'examples': ['example1', 'example2'], 'title': 'String', 'type': 'integer'}, 'boolean': {'examples': [True, False], 'title': 'Boolean', 'type': 'boolean'}, 'number': {'examples': [42, 7, 100], 'title': 'Number', 'type': 'integer'}}, 'required': ['string', 'boolean', 'number'], 'title': 'Failed', 'type': 'object', 'additionalProperties': False}, description=Unset(), strict=True)

Process finished with exit code 0