That's the release where the published benchmarks happened and where multiple developers got involved.
No plan to release on Pharo 7 alpha. Ask again once Pharo 7 is released.
Repository is in migration though, I migrated to github earlier this year, but with recent changes & new organization, I think the repository will be merged with open-smalltalk-vm repository. Documentation will be merged too, so it's going to be easier to build images and matching VMs or move code from VM-side to image-side or the other way around.
I think questions related to Sista should be on vm-dev since there are only alpha releases (i.e. no interest for non VM developers).
Thanks for the quick response.
I had some strange behaviour where method A in a loop was calling method B, and a halt I added to method B wasn't triggering.
I wondered might Sista be in the default Pharo 7 image, but your answer clarified that its not - its still alpha.