Having `ptr` or `pointer` would disable GC for that object alone. There are also `GC_ref` and `GC_unref` to fine control whether it will be ready to collected or not. Both procs especially useful when importing `cstring` from C lib.
This should help for GC tuning, [https://nim-lang.org/docs/gc.html](https://nim-lang.org/docs/gc.html)
