Base64 optimization question on Twitter (https://twitter.com/davidfowl/status/1679223885256957952?s=20)

Optimize.cs

using System.Text.Json;
using System.Text.Json.Serialization;

var data = new[]
{
    "Hello"u8.ToArray(),
    "Twitter"u8.ToArray(),
    "Optimize"u8.ToArray()
}
.Select(m => new Message(m)).ToArray();

var response = new Response(MessageBytesToString(data));

Console.WriteLine(JsonSerializer.Serialize(response));

// Turn a list of messages into a single comma separated base64 encoded string
string MessageBytesToString(Message[] messages)
{
    return string.Join(",", messages.Select(m => Convert.ToBase64String(m.Payload)));
}

class Message(byte[] bytes)
{
    public byte[] Payload => bytes;
}

class Response(string messages)
{
    [JsonPropertyName("messages")]
    public string Messages => messages;
}