> There are unsafe blocks all over the stdlib
Physics is unsafe. Something, somewhere needs to provide the safe core.
> And concurrency safety would need to get rid of their blocking IO, which they haven't even acknowledged.
Is your position that blocking IO can't be compatible with concurrency safety? That's a strange claim. Can you explain?
Sure, but then they shout all over how safe they are. They got rid of the safeties pretty late, when they ripped out their GC, but kept their false promises all over.
No, that's common knowledge. I fixed concurrency safety by forbidding blocking IO. Others also. Maybe there are other ways, but never heard of other ways.