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The justification is that this change is necessary for people to try GOEXPERIMENT=rangefunc and see the high-performance iter.Pull that we expect rather than the low-performance one that can be implemented without runtime changes. The changes are limited to the implementation of iter.Pull - if you're not using it, there is no risk. And the change are only visible when using GOEXPERIMENT=rangefunc - if you don't set it, you can't get at any of this code. So the risk to the overall release is as close to zero as a change can be.