Cookie 5.5 empty cookie name

[essen]

Step 4 says:

Serialize the cookie-list into a cookie-string by processing each cookie in the cookie-list in order:
1. Output the cookie’s name, the %x3D (“=”) character, and the cookie’s value.
2. If there is an unprocessed cookie in the cookie-list, output the characters %x3B and %x20 (“; “).

However looking at WPT tests (for example [1] / [2]) I can see that when we have Set-Cookie: foo (empty name with value foo) the expectation is to have Cookie: foo back, so perhaps these instructions should include a special case when the cookie name is empty.

[1] https://github.com/web-platform-tests/wpt/blob/master/cookies/http-state/resources/test-files/0004-test
[2] https://github.com/web-platform-tests/wpt/blob/master/cookies/http-state/resources/test-files/0004-expected