Confusion about passing tuple-type values to the timeout parameter of the Timeout class

[marigoold]

In this code section, it appears that the timeout parameter can accept a tuple of length 2 to 4. However, when I do this, the type system reports an error.
Reproduction steps:

1. Create a file test_httpx_timeout.py

import httpx
timeout = httpx.Timeout((10.0, 30.0))

2. Check it with mypy mypy test_httpx_timeout.py and I get the following error:

test_httpx_timeout.py:2: error: Argument 1 to "Timeout" has incompatible type "tuple[float, float]"; expected "float | tuple[float | None, float | None, float | None, float | None] | Timeout | None | UnsetType"  [arg-type]
Found 1 error in 1 file (checked 1 source file)