Summary

• Add an explicit RequestsCookieJar.__iter__ override returning Iterator[Cookie].
• Add a regression test that asserts iterating over RequestsCookieJar yields Cookie objects.

Reproduction

• Issue Bad typing for requests.cookies.RequestsCookieJar #15457 shows that type checkers can treat RequestsCookieJar as Iterable[str] through its MutableMapping[str, str] base even though runtime iteration yields http.cookiejar.Cookie.

Root cause

• The stub models RequestsCookieJar as MutableMapping[str, str] for its mapping-like APIs, but did not explicitly override the conflicting iterator type inherited from CookieJar/runtime behavior.

Changes

• Declared RequestsCookieJar.__iter__ as Iterator[Cookie].
• Added stubs/requests/@tests/test_cases/check_cookies.py to cover the iterator type with assert_type.

Tests

• PATH="$PWD/.venv/bin:$PATH" .venv/bin/python tests/runtests.py stubs/requests
• git diff --check

Screenshots/Logs

• Not applicable; type stub/test-only change.

AI disclosure

• Prepared with assistance from Codex.

Fixes #15457