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I tried this code https://gist.github.com/pgsin/2816cf5b69cd3c9b6b4ccc55ac99c02f.
I got the same result between mono and .net on windows (Microsoft Windows [Version 10.0.15063]), but 1-bit discrepancy between mono on linux (Ubuntu 16.04.2 LTS) vs mono on windows (the same).
Math.Log has the same issue - https://goo.gl/Tqydtb
Our behaviour matches other runtime on linux and macOS, and it also matches the behaviour of .NET Core. We will then not fix it, and will keep that as a platform-specific behaviour.
Thank you very much for your report