Can anyone explain this strange behavior with signed floats in C#?

Question

Here is the example with comments:

class Program
{
    // first version of structure
    public struct D1
    {
        public double d;
        public int f         


        

Answer 1

Just an update for this 10 years old bug: it has been fixed (Disclaimer: I'm the author of this PR) in .NET Core which would be probably released in .NET Core 2.1.0.

The blog post explained the bug and how I fixed it.