The ETL works by assigning a "signature hash" to every stateful interaction. When two hashes collide under non-identical conditions, the ETL spawns a sandboxed mirror process to test the interaction without halting the main thread. This was the single most requested feature from v1.2 users.
Version 1.3 represents a mature, battle-tested iteration of an idea that began as a whiteboard scribble and became a production workhorse. Respect the recursion. Mind the checkpoints. And always, always sign your state. Big Long Complex -v1.3-