Mypy error when initializing from a dictionary

[mikeoconnor0308]

Migrating from pydantic V1 BaseSettings to the pydantic_settings module, I encountered the following mypy issue when instantiating a settings object from a dictionary:

from pydantic_settings import BaseSettings

class MySettings(BaseSettings):
    FOO: str = "default"
    BAR: int = 123

settings = {"FOO": "foo", "BAR": 456}

my_settings = MySettings(**settings)

running mypy on this snippet produces:

base_settings_mypy.py:9: error: Argument 1 to "MySettings" has incompatible type "**dict[str, object]"; expected "bool | None"  [arg-type]
base_settings_mypy.py:9: error: Argument 1 to "MySettings" has incompatible type "**dict[str, object]"; expected "str | None"  [arg-type]
base_settings_mypy.py:9: error: Argument 1 to "MySettings" has incompatible type "**dict[str, object]"; expected "Path | str | Sequence[Path | str] | None"  [arg-type]
base_settings_mypy.py:9: error: Argument 1 to "MySettings" has incompatible type "**dict[str, object]"; expected "bool | list[str] | tuple[str, ...] | None"  [arg-type]
base_settings_mypy.py:9: error: Argument 1 to "MySettings" has incompatible type "**dict[str, object]"; expected "CliSettingsSource[Any] | None"  [arg-type]
Found 5 errors in 1 file (checked 1 source file)

This works fine in pydantic V1.

Version info (conda forge)

# Name                    Version                   Build  Channel
mypy                      1.14.1          py311h917b07b_0    https://conda.anaconda.org/conda-forge
pydantic                  2.10.4             pyh3cfb1c2_0    https://conda.anaconda.org/conda-forge
pydantic-core             2.27.2          py311h3ff9189_0    https://conda.anaconda.org/conda-forge
pydantic-settings         2.7.1              pyh3cfb1c2_0    https://conda.anaconda.org/conda-forge

[hramezani]

@dmontagu do you have time to take a look at this?