Edge case issue with System.Numerics.BigInteger

[I-Omnibus]

/*
 * Microsoft Visual Studio Community 2022
 * Version 17.4.0 Preview 1.0
 * VisualStudio.17.Preview/17.4.0-pre.1.0+32804.182
 * Microsoft .NET Framework
 * Version 4.8.03761
 */
using System.Numerics;
using System.Runtime.Versioning;

namespace Csharplang;
/// <summary>
/// Edge case disagreement between System.BitConverter
/// and System.Numerics.BigInteger as to the size in bytes.
/// </summary>
internal sealed partial class Issue {

   [Test(Description = "Always passes when bit 31 is clear", Author = "I-Omnibus")]
   public void WhenPotentialSignBitClear() {
      var value = ScenarioFor(UInt32.MaxValue >> 1);
      Assert.That(value.actual, Is.EqualTo(value.expected));
   }

   [Test(Description = "Always fails when bit 31 is set", Author = "I-Omnibus")]
   public void WhenPotentialSignBitSet() {
      var value = ScenarioFor(UInt32.MaxValue);
      Assert.That(value.actual, Is.EqualTo(value.expected));
   }

   private (int actual, int expected) ScenarioFor(UInt32 value) {
      var byteArray = BitConverter.GetBytes(value);
      var bigInteger = new BigInteger(byteArray, IsUnsignedTrue, IsBigEndianFalse);
      var expected = byteArray.Length;
      var actual = bigInteger.ToByteArray().Length;
      return (actual, expected);
   }

   private const bool IsUnsignedTrue = true;
   private const bool IsBigEndianFalse = false;
}

[333fred]

This is an issue for the dotnet/runtime repository, not csharplang. cc @tannergooding .

[I-Omnibus]

I'm reluctant to duplicate this issue but I'm unsure how, or even if I have the privileges to transfer it. cc @tannergooding .

[svick]

This is now a duplicate of #77729.