Did you really saw that Calypso was affected?
I do not know how to review this changes now. The pull request is closed. And I doubt that I will be able to merge changes back (I do not know how to do it).

2018-03-01 16:39 GMT+01:00 Stephane Ducasse <stepharo.self@gmail.com>:
I have a change that crosscuts calypso and iceberg.
I will produce a PR and each project should check because else I will get stuck
waiting in an integration deadlock.

https://pharo.fogbugz.com/f/cases/21459/Fixing-last-users-of-theNonMetaclass