<PackageReference Include="System.Collections.Immutable" Version="11.0.0-preview.1.26104.118" />

System.Collections.HashHelpers

static class HashHelpers
namespace System.Collections { internal static class HashHelpers { public static bool IsPrime(int candidate); public static int GetPrime(int min); public static ulong GetFastModMultiplier(uint divisor); public static uint FastMod(uint value, uint divisor, ulong multiplier); } }