[Pharo-project] what is the magic with MCVersionInfo allInstances do: [ :each | each instVarNamed: 'ancestors' put: nil ]. ' ?

Hi guys. Can a MC guy tell me what happens when I do: MCVersionInfo allInstances do: [ :each | each instVarNamed: 'ancestors' put: nil ]. what is what is actually clean? is that useful? what are the consequences/impact when I do that? is my image broken? can I still use monticello browser and all my projects with it? thanks -- Mariano http://marianopeck.wordpress.com