Handling referencing class parent instances in a GC friendly way.

[realhet]

On Monday, 30 November 2020 at 14:36:08 UTC, FeepingCreature 
wrote:
> On Monday, 30 November 2020 at 14:33:22 UTC, realhet wrote:
> ...
> Though you may want to do `items = null;` too.

I just forgot 1 of three things, thx for pointing it out.
And I also forget to notify the parent to remove the reference 
from its items list.