[Issue 20205] std.math: Wrong result for abs(int.min)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20205

--- Comment #2 from Dominikus Dittes Scherkl <dominikus at scherkl.de> ---
unittest
{
   byte a = -128;
   auto b = abs(a);
   assert(is(typeof(b) == ubyte));
   assert(b == 128);
}

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