Follow-up Comment #4, bug #22246 (project gnustep): The diagnosis may well be correct, but the I simply can't be sure from looking at the example program. The problem is that the test program is not the simple testcase for KVO I was looking for, but instead implicitly includes all the gui bindings stuff ... so without a clear understanding of bindings (and a surety that they are implemented the same way in macos/gnustep) it seems impossible to tell whether the difference in behaviors of the test app on the two systems is caused by a difference in KVO implementations or a difference in KVB implementations... That is to say, it's a test to demonstrate a gui bug without demonstrating whether the bug arises in the gui (KVB) or from an underlying fault in base (KVO). I guess I'll have to look at the KVB code to see exactly what it does and produce a testcase for KVO.
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