Make identity hashing aware of JavaProxy#8614
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This change makes compare_by_identity Hash instances know about our JavaProxy wrapper type and treat as identical two wrappers that contain the same object. This will add overhead to all identity hashes in order to type check the incoming keys: * It must know to calculate the identity hash based on the contained object and not the wrapper (affects all identity Hash). * It must also try to unwrap proxies and compare contents when traversing existing entries (only affects identity Hash when a key does not already exist). This fixes the identity Hash portion of jruby#8612.
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This needs tests but I think we are pretty safe including it in an upcoming release. It does not appear to be necessary to fix issues in @kalenp's application, so there's no rush to include it in 9.4.12.0. After discussion we decided that we could not think of a case where someone would not want two equivalent Java object wrappers to appear identical to an identity Hash, and lots of reasons why that behavior is almost certainly unexpected. Since currently it's just broken, as illustrated by my example in #8612, this is a net positive functionality fix. Note I have not done any benchmarking to see how the additional type-checking affects identity Hash performance, so that should happen before merge as well. |
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This change makes compare_by_identity Hash instances know about our JavaProxy wrapper type and treat as identical two wrappers that contain the same object. This will add overhead to all identity hashes in order to type check the incoming keys:
This fixes the identity Hash portion of #8612.