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Please see my comments on the issue.

The performance impact of this change is measurably negative, therefore unacceptable. 😦

Here's the lesson I learned: generators are great for deferring computation, but they don't necessarily beat a focused loop with if- and break- statements in the right places. My code would be acceptable if the only criterion were functional and "tell me what you're doing, not how", but the logging package must also stay out of the way of real applications, performance-wise.