Minimize GC memory footprint

[Imperatorn]

On Saturday, 6 February 2021 at 09:42:38 UTC, rikki cattermole 
wrote:
> On 06/02/2021 3:32 PM, frame wrote:
>>  [...]
>
> This won't do anything.
>
>>  [...]
>
> Don't forget to stdout.flush; Otherwise stuff can get caught in 
> the buffer before erroring out.
>
>> [...]
>
> Turn on the precise GC, 32bit is a bit too small of a range and 
> you can get false positives like in this case (at least looks 
> like it).

For reference, how does one turn on precise GC?