/// <summary>
/// 确定actual的数据类型，是否与expected类型匹配
/// </summary>
/// <param name="actual"></param>
/// <param name="expected"></param>
/// <param name="permitNull"></param>
public static void IsAssignable(StackItem actual, Type expected, bool permitNull)
{
IsAssignable(actual, new StackItem(expected), permitNull);
}
public static void AreEqual(StackItem actual, Type expected)
{
AreEqual(actual, new StackItem(expected));
}