Feature: Support upcoming PHP 8 release. (#246 by @clue)

Feature: Change default socket backlog size to 511. (#242 by @clue)

Fix: Fix closing connection when cancelling during TLS handshake. (#241 by @clue)

Fix: Fix blocking during possible accept() race condition when multiple socket servers listen on same socket address. (#244 by @clue)

Improve test suite, update PHPUnit config and add full core team to the license. (#243 by @SimonFrings and #245 by @WyriHaximus)