Allow tuple as input of query parameters.

[SarunasAzna]

In the documentation it is stated that params can be dict, string or two
tuples. This allows to used two tuples. Previously it was possible to
use only tuple inside a list.

[StephenBrown2]

The documentation is not wrong, it states specifically that "a list of two-tuples" is allowed.

params - (optional) Query parameters to include in request URLs, as a string, dictionary, or list of two-tuples.

While a tuple of two-tuples should be fine, I'd like to hear the other maintainers thoughts on it. If accepted, you will also need to update the documentation to include "list or tuple of two-tuples." everywhere query params are mentioned, and adjust the QueryParamTypes signature:

httpx/httpx/_types.py

Lines 34 to 41 in 354c4ca

	QueryParamTypes = Union[
	"QueryParams",
	Mapping[str, Union[PrimitiveData, Sequence[PrimitiveData]]],
	List[Tuple[str, PrimitiveData]],
	str,
	bytes,
	None,
	]

to include Tuple[Tuple[str, PrimitiveData]], which should fix the currently failing mypy tests.

[SarunasAzna]

@StephenBrown2 good point about the docs! So actually I think it is important to mention how I found this thing - at the moment we are moving some API agents from requests to httpx and the test with two tuples failed.

[StephenBrown2]

Ah yes, that is an important note! We certainly want to maintain requests compatibility where possible, so go ahead and make the changes I suggested and the others can weigh in once that's done.

[florimondmanca]

👍 LGTM as this is — "sequence" in the docs, (list, tuple) in implementation.

[florimondmanca]

@SarunasAzna Thanks!