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Re: Restoring objects

bill@cambridge.apple.com (Bill St. Clair) writes:

> The only drawback with this is that no instance of cleanup-mixin
> will be gc'able. You can solve this by using weak hash tables
> (undocumented, but present in both 2.0b1 and 2.0 final).

What are "weak hash tables", how do they work, and what are they good