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I have squashed all commits into one, since they didn't really add anything interesting to history. |
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looking good to me ... the new logic seems much easier to follow 👍 |
The old recursion guard (ported from MRI years ago) had a number of flaws: * It forced an object ID for every object encountered. * It created transient objects for every recursive stack. * It was not using identity hashing (#3887). * It used a RubyHash internally, which has much more overhead than a typical JDK Map. The new implementation largely follows the pattern of the original but fixes all the above items. It passes all untagged specs. See also #3884, which started this whole thing.
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Dunno if anyone wants to review this (e.g. @enebo or @kares) but it appears to have passed all tests and eliminates some really ugly misfeatures of the original port.
Note that I have not removed the old impl in case an external library uses it.