an add-finalizer! by any other name

[Andy Wingo]

Hello,

I had a realization yesterday, that our documentation misses the point
of guardians.  Guardians exist to allow finalization of resources
without introducing concurrency.  However if you pump a guardian from
the after-gc-hook, as recommended by "GC Hooks" in the manual, a
guardian is simply a finalizer, implemented in a roundabout way.

Food for thought!

Andy
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