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Matt Stancliff authored
The classic (min+max)/2 is provably unsafe. Fixed as recommended in research: http://googleresearch.blogspot.com/2006/06/extra-extra-read-all-about-it-nearly.html Fix inspired by @wjin, but I used a different approach. (later, I found @kuebler fixed the same issue too). Fixes #1741, #1602
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