The GenServer does little allocations which means it’s heap is kept small - GCs will be more frequent getting rid of the issue of holding on too long to the references to binaries. The binary leak is most prominent with processes that have huge heaps - this can happen if for a normally “quiet” process you have one, infrequent operation that is extremely memory expensive. This operation will cause the heap to balloon, and later will keep the GCs rare in regular operation, since there’s still a lot of free memory left - causing the process to hold on to the binary references for longer than it should.
Keeping the overall heap of the process small will prevent it from holding on too long to those references.
