Fix wrong type annotations

[oliversen]

No description provided.

[Matoran]

They are correct you can use dotenv_path or stream to create a dotenv (which make both optionals). Encoding is also optional for tempfile https://docs.python.org/3/library/tempfile.html.

[oliversen]

If the Optional type is specified, then we must set the default value for the parameter. In this case, it is necessary to rewrite further code.
Correctly dotenv_path: StrPath or dotenv_path: Optional[StrPath] = None

[Matoran]

I agree with dotenv_path: Optional[StrPath] = None, the DotEnv object is build on load_dotenv which first arg is dotenv_path: Optional[StrPath] = None.

[bbc2]

Right, this doesn't seem to pass validation:

> tox -e lint
lint: install_deps> python -I -m pip install mypy ruff
lint: commands[0]> ruff check src tests
All checks passed!
lint: commands[1]> ruff format --check src tests
19 files already formatted
lint: commands[2]> mypy --python-version=3.14 src tests
src/dotenv/main.py:193: error: Argument "encoding" to "rewrite" has incompatible type "str | None"; expected "str"  [arg-type]
src/dotenv/main.py:228: error: Argument "encoding" to "rewrite" has incompatible type "str | None"; expected "str"  [arg-type]
src/dotenv/main.py:377: error: Argument "dotenv_path" to "DotEnv" has incompatible type "str | PathLike[str] | None"; expected "str | PathLike[str]"  [arg-type]
src/dotenv/main.py:414: error: Argument "dotenv_path" to "DotEnv" has incompatible type "str | PathLike[str] | None"; expected "str | PathLike[str]"  [arg-type]
Found 4 errors in 1 file (checked 19 source files)
lint: exit 1 (2.19 seconds) /home/bertrand/code/python-dotenv> mypy --python-version=3.14 src tests pid=171546
  lint: FAIL code 1 (5.67=setup[3.45]+cmd[0.01,0.01,2.19] seconds)
  evaluation failed :( (5.70 seconds)