In that blog, the arena is managed by the underlying library, and the programmer has no control over when memory is returned, and sometimes the underlying libra

In that blog, the arena is managed by the underlying library, and the programmer has no control over when memory is returned, and sometimes the underlying library keeps the memory around when the programmer doesn't want it to. It sounds like cyber_kinetist is talking about manually managing the arena, so then the programmer is in direct control of when the memory is returned, so the problem won't happen.