The type loader has silent integer overflows

[VSadov]

From: #95193 (comment)

These silent integer overflows are present in handling of LayoutKind.Sequential as well. For example, this:

Console.WriteLine(sizeof(X));

struct X
{
   byte x;
   BigArray a;
}

[StructLayout(LayoutKind.Sequential, Size = int.MaxValue)] 
struct BigArray
{
}

prints -2147483648.

[lambdageek]

/cc @steveisok