[MessagePackObject]
public class Test
{
    [Key(0)]
    readonly string _test;

    [SerializationConstructor]
    public Test(string test)
    {
        _test = test ?? "I am never null :D";
    }

    [IgnoreMember]
    public string Prop => _test;
}

[Fact]
public void AllowPrivateTest()
{
    // write an empty array to seq
    using var seq = new Sequence<byte>();
    var writer = new MessagePackWriter(seq);
    writer.WriteArrayHeader(0);
    writer.Flush();

    // deserialize as Test
    var data = seq.AsReadOnlySequence;
    var resolver = StandardResolverAllowPrivate.Instance;
    var options = MessagePackSerializerOptions.Standard.WithResolver(StandardResolverAllowPrivate.Instance);
    var test = MessagePackSerializer.Deserialize<Test>(in data, options);

    // check test
    Assert.NotNull(test.Prop);
}

member = new EmittableMember
{
    FieldInfo = field,
    IsReadable = allowPrivate || field.IsPublic,
    IsWritable = allowPrivate || (field.IsPublic && !field.IsInitOnly),
    StringKey = firstMemberByName ? item.Name : $"{item.DeclaringType.FullName}.{item.Name}",
};