Created from https://github.com/aio-libs/aiohttp/issues/4451 . happy_eyeballs_delay and interleave are not documented in the signature at [0] though the parameters were explained below . Andrew, feel free to update if there is any additional action needed besides signature update. I guess it could be tagged as a good newcomer friendly issue.

[0] https://docs.python.org/3/library/asyncio-eventloop.html#asyncio.loop.create_connection

Ideally, a small chapter with a description of Happy Eyeballs algorithm would be nice to have but I don't insist.

Updating the method signature is a big step anyway.

Created PR added arguments to method signature in doc.
GH-18315

New changeset 5305cc9dbfe8a5a0ab666511f3ba7f026c8983f8 by idomic in branch 'master':
bpo-39128: Added happy_eyeballs_delay, interleave to function signature (GH-18315)
https://github.com/python/cpython/commit/5305cc9dbfe8a5a0ab666511f3ba7f026c8983f8

New changeset af95d790a86fc46739badfa9edbaeb264ee96600 by Miss Islington (bot) in branch '3.8':
bpo-39128: Added happy_eyeballs_delay, interleave to function signature (GH-18315)
https://github.com/python/cpython/commit/af95d790a86fc46739badfa9edbaeb264ee96600

I merged the first PR about adding parameter, but I'm not closing this issue yet, as Andrew said, a small chapter with a description of Happy Eyeballs algorithm would be nice, if anyone want to write a PR, go for it.

Thanks Julien, I forgot about this part, will create a new PR.

I thought referencing the abstract of the algorithm + a link to the IETF RFC:

  Happy Eyeballs: Success with Dual-Stack Hosts
   When a server's IPv4 path and protocol are working, but the server's
   IPv6 path and protocol are not working, a dual-stack client
   application experiences significant connection delay compared to an
   IPv4-only client.  This is undesirable because it causes the dual-
   stack client to have a worse user experience.  This document
   specifies requirements for algorithms that reduce this user-visible
   delay and provides an algorithm.

https://tools.ietf.org/html/rfc6555

Created 2nd PR with the Algorithm documentation:
GH-18523

Created new PR and removed the old one GH-18624

New changeset 8af4712a16e4b7d1b60f1faec13cd7a88da95f6a by idomic in branch 'master':
bpo-39128: Added algorithm description (GH-18624)
https://github.com/python/cpython/commit/8af4712a16e4b7d1b60f1faec13cd7a88da95f6a

Thanks, Ido

New changeset 1f4cf0c22b00fefb17611546755b65d3cb488330 by Miss Islington (bot) in branch '3.8':
bpo-39128: Added algorithm description (GH-18624)
https://github.com/python/cpython/commit/1f4cf0c22b00fefb17611546755b65d3cb488330