If you’re running a 10.90 cross-compiled by 10.1.10, you should do a native compilation from 10.90 to 10.90. Otherwise gc-renamed-object? won’t be open-coded, which could affect performance.
Thanks for the idea. I'm doing that now on all three of my systems.
As for other problems from this transformation, I’m working on cleaning up the system-pair-car usages. But so far there’s nothing problematic in the runtime system. There are known problems in sos and edwin though.
There must be a bug somewhere in the runtime system since I encountered that error without using Edwin or SOS. Sorry, though, I didn't manage to capture a stack trace. I assumed that I would be able to reproduce it, so I didn't save the first one, and I haven't seen it happen again. If I see it, I'll capture one this time.