31 Jul 2017 4.0-rc1 release

28 Aug 2017

11 Sep 2017

9 Oct 2017

18 Oct 2017 current-testing freeze before 4.0-rc2

4 Sep 2017

18 Sep 2017

16 Oct 2017

23 Oct 2017 4.0-rc2 release

6 Nov 2017 decide whether 4.0-rc2 is the final 4.0

20 Nov 2017 current-testing freeze before 4.0-rc3

27 Nov 2017 4.0-rc3 release

11 Dec 2017 decide whether 4.0-rc3 is the final 4.0

1 Jan 2018 current-testing freeze before 4.0-rc4

8 Jan 2018

31 Jan 2018 4.0-rc4 release

22 Jan 2018

14 Feb 2018 decide whether 4.0-rc4 is the final 4.0

27 Feb 2018 current-testing freeze before 4.0-rc5

6 Mar 2018 4.0-rc5 release

20 Mar 2018 decide whether 4.0-rc5 is the final 4.0