Bug description

Consider a Uri with default port (https://example.com:443/)

After a serialization/deserialization roundtrip, the resulting Uri.OriginalString doesn't contain the port anymore (https://example.com/). The messagepack UriFormatter should use Uri.OriginalString instead of Uri.ToString() to ensure lossless serialization?

Newtonsoft.Json and System.Text.Json both

We should add the Dispose pattern to the style guide so we don't have to go hunting for it whenever we need it. We should also audit the existing code to make sure it follows the correct pattern where it needs to.

private bool disposed;
public virtual void Dispose(bool disposing)
{
    if (disposed) return;
    disposed = true;
    if (disposing) {
        // dispose managed stuff