@Bogdan_Chipara If you knew in advance which components would cause trouble ( there’s a full list over here ) it’s possible to create the obsolete versions in GH1.0 by typing the # key into the search box, although that presents you with all components (even those obsoleted many times over) in seemingly random order:
I don’t think you would have to do anything to ensure forward-compatibility from 0.9 to 1.0, it’s the other way round that causes disappearing components (as far as I’m aware)