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Time::HiRes::ualarm micro-second argument is signed 32 bit integer.
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| $ perl -MTime::HiRes=ualarm -E 'ualarm(3600 * 10**6);' | |
| Time::HiRes::ualarm(-694967296, 0): negative time not invented yet at -e line 1. | |
| $ perl -MTime::HiRes=ualarm -E 'ualarm(360 * 10**6);' | |
| $ perl -MTime::HiRes=ualarm -E 'say(log(3600 * 10**6)/log(2));' | |
| 31.7453497605412 |
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