false-positive warning wiht pydantic 2.6.0 "Unexpected extra items present in tuple"

[schenker]

Initial Checks

• I confirm that I'm using Pydantic V2

Description

With pydantic 2.6.0 the example below gives me a false positive warning:

from pydantic import BaseModel

class Point(BaseModel):
    coordinates: tuple[float, float] | tuple[float, float, float]

print(Point(coordinates=(1.0, 2.0)).model_dump())
print(Point(coordinates=(1.0, 2.0, 3.0)).model_dump())

Output:

{'coordinates': (1.0, 2.0)}
/home/me/workspace/myproject/venv/lib/python3.10/site-packages/pydantic/main.py:314: UserWarning: Pydantic serializer warnings:
  Unexpected extra items present in tuple
  return self.__pydantic_serializer__.to_python(
{'coordinates': (1.0, 2.0, 3.0)}

With pydantic 2.5.3 the example does not produce any warnings.

Example Code

from pydantic import BaseModel

class Point(BaseModel):
    coordinates: tuple[float, float] | tuple[float, float, float]

print(Point(coordinates=(1.0, 2.0)).model_dump())
print(Point(coordinates=(1.0, 2.0, 3.0)).model_dump())

Python, Pydantic & OS Version

$ python -c "import pydantic.version; print(pydantic.version.version_info())"
             pydantic version: 2.6.0
        pydantic-core version: 2.16.1
          pydantic-core build: profile=release pgo=true
                 install path: /home/me/workspace/myproject/venv/lib/python3.10/site-packages/pydantic
               python version: 3.10.13 (main, Aug 25 2023, 13:20:03) [GCC 9.4.0]
                     platform: Linux-5.15.0-91-generic-x86_64-with-glibc2.31
             related packages: mypy-1.8.0 typing_extensions-4.9.0
                       commit: unknown

[sydney-runkle]

@schenker,

Thanks for the report. We'll look into a fix for this to be included in a patch release soon!

[schenker]

Thanks for the quick fix!