[Pharo-project] Did Pharo 2.0 Update #20200 break Metacello bootstrapping?

(Posting to Metacello and Pharo-project lists) Metacello bootstraps in #20199, but not #20200, #20201, or #20202. Try: Gofer new url: 'http://ss3.gemstone.com/ss/Versionner'; package: 'ConfigurationOfVersionner'; load. (Smalltalk at: #ConfigurationOfVersionner) project development load:#('Core' 'Spec'). When the dialog pops up about loading a package with unsaved changes, if you choose merge and keep the current version for all the removed classes and methods, it bootstraps. If you "Load" instead of Merge, it fails with "MessageNotUnderstood: IdentitySet>>copyAfter:" Sean