[Pharo-project] [Help to review/test] Crash when downloading FFI

Hi! I've given a shot trying to get a fix for this case. Thanks to Eliot, I think I reached a solution, but since I had some random results at first, I'd like if someone else can take 5 minutes and validate. https://pharo.fogbugz.com/f/cases/10134/SpecialObjectsArray-should-not-chang... To test, the following snippet does not have to crash: Gofer it smalltalkhubUser: 'DBXTalk' project: 'DBXTalkDriver'; configurationOf: 'OpenDBXDriver'; loadStable. Thanks very much! Guille