id,summary,reporter,owner,description,type,status,priority,milestone,component,resolution,keywords,cc,phab_field
3374,Non-tree Maps and Sets are not serialized properly,Itms,,"The `Map` and `Set` JS containers are not serialized properly when they contain multiple references to the same object. The backref system is broken for them, probably because of our custom implementation that has a flaw.

Attached are:
* A patch introducing a new test which currently fails,
* A patch and a commands.txt for reproducing the error.
They apply to r16930.",defect,new,Must Have,Backlog,Core engine,,,sanderd17 Yves,