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From: ondrej@isc.org
Subject: Implicint typing to int leads to singed/unsigned confusing when
 shifting the top bit
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Date: Thu, 30 Nov 2017 16:48:32 +0000
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The UndefinedBehaviorSanitizer found a couple of issues where the value of non uint32_t type was implicitly typed to int and then the top bit would be shifted.  It's probably harmless if size of int == 4, but I am afraid that it might be broken completely on platforms where sizeof(int) < 4.