> Adding manual arena memory management seems like a weird choice for a supposedly memory-safe and GC'd language where this is supposed to be an implementation

> Adding manual arena memory management seems like a weird choice for a supposedly memory-safe and GC'd language where this is supposed to be an implementation issue. Yes, it's because Go's GC is primarily tuned for latency at the cost of (memory allocation) throughput. Furthermore, there are only a few knobs for Go's GC. If Go's GC is implemented a bit differently and has a few more knobs so that it can be optimized for memory allocation throughput, maybe Go doesn't need an arena library. I don't even know other GC-ed languages that have/need an arena library because their GC is customizable enough.