Issue 1565: [FIX] Improve performance of weak key dictionaries
When Martin von Loewis visited SCG in 2007, he did some nice enhancements to weakkeydictionaries...
The problem is that they are re-hashed far to often (when a nil key is found, which happens frequently
if the keys are garbagecollected often...)
For me, this change translates to a ca. 20% improvement in Monticello performance.
Original bug report:
0006348: [FIX] Improve performance of weak key dictionaries
http://bugs.squeak.org/view.php?id=6348 Marcus
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