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Fix: chunked range loops poll once per chunk (#280) - #284
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The #206 chunk loop ran TP_POLL_INTERVAL iterations and then a countdown poll, so tp_poll_slow ran every 4096*4096 iterations. Now the slow poll runs once per chunk. Red: a SIGALRM KeyboardInterrupt arrived only after a 12M-iteration loop finished. Benchmarks' compiled set unchanged.
Closes #280