[Pharo-dev] chunk file format (unrecoverable changes)

Do we have a documentation about the format of - class definitions - methods - class comments for the changes file ? I am asking because some entries are using two separator "! !" and some only one "!" And we have a problem with the "Recover lost changes" browser (https://pharo.fogbugz.com/f/cases/16498/unrecoverable-changes) and I am not sure if this is a bug on the code importer or if it is a bug on how we write changes to the changes file. nicolai