The BEAM Is Not Like Other Runtimes (And That's Why Elixir Scales the Way It Does)

You have been writing Elixir for a while. You know GenServers. You know supervisors. You have hit the BEAM's concurrency model enough times to trust it. But there is a level below that which most Elixir developers never look at, and it explains a lot of behavior that otherwise seems like magic. Why does spawning a hundred thousand processes not kill your system? Why is a process crash isolated but not silent? Why does garbage collection in Elixir not stop the world? The answers are all in the BE