Currently, in C# we do the following:

client.Repos["owner"]["repo"].Pulls.GetAsync();

And it gets translated to something like this in other languages:

client.ReposByOwner("owner").ByRepo("repo").Get();

Though, we believe it would be a better experience to have it within the Repos request builder vs. as part of the root of the clent like this:

client.Repos.ByOwner("owner").ByRepo("repo").Get();

This would be a breaking change if we implement this change.