fix: apply _cookie_value_to_unicode to list-branch cookie key/value

scrapy/utils/request.py

@@ -213,7 +213,7 @@ def request_to_curl(request: Request) -> str:
             cookie = "; ".join(
                 f"{_cookie_value_to_unicode(c['name'])}={_cookie_value_to_unicode(c['value'])}"
                 if "name" in c and "value" in c
-                else f"{next(iter(c.keys()))}={next(iter(c.values()))}"
+                else f"{_cookie_value_to_unicode(next(iter(c.keys())))}={_cookie_value_to_unicode(next(iter(c.values())))}"
                 for c in request.cookies
             )
             cookies = f"--cookie '{cookie}'"

tests/test_utils_request.py

@@ -468,3 +468,16 @@ class TestRequestToCurl:
             " --data-raw '{\"foo\": \"bar\"}' --cookie 'foo=1'"
         )
         self._test_request(request_object, expected_curl_command)
+
+    def test_cookies_list_bytes_nonstandard_key(self):
+        request_object = Request(
+            "https://www.httpbin.org/post",
+            method="POST",
+            cookies=[{b"foo": b"bar"}],
+            body=json.dumps({"foo": "bar"}),
+        )
+        expected_curl_command = (
+            "curl -X POST https://www.httpbin.org/post"
+            " --data-raw '{\"foo\": \"bar\"}' --cookie 'foo=bar'"
+        )
+        self._test_request(request_object, expected_curl_command)