Serialization Error when string start with quote (')

[vicancy]

Quote should be escaped.
SyntaxErrorException throws when I serialize and deserialize a string 'a.

REPRO

using System.IO;
using YamlDotNet.Serialization;

public class Program
    {
        static void Main(string[] args)
        {
            string k = "'a";
            using (StringWriter writer = new StringWriter())
            {
                new Serializer().Serialize(writer, k);
                using (StringReader reader = new StringReader(writer.ToString()))
                {
                    var j = new Deserializer().Deserialize<string>(reader);
                }
            }
        }
    }