@RAOF I don't remember exactly but IIRC it had to do with the quantity of code emitted in landing pad cleanups, possibly we were experimenting with the idea that LLVM would coalesce them better inside normal code (keep in mind: "zero cost" EH has nonzero codegen costs, it's just hypothetically "cheaper at runtime")

Or else we were still trying to decide how to deal with encoding panic for FFI (currently .. I think somewhat punted on?)