Turbo Drive, Frames and Streams: a reference verified against the source

Turbo’s documentation isn’t incomplete, it’s unconnected: Drive, Frames and Streams sit side by side with nothing saying what links them or how to choose. This is the reference I wanted when I started, written by reading the source of Turbo 8.0.23 and turbo-rails 2.0.23 rather than the docs, because that is where the gaps are.