Lockstep v0.2.0 brings typed actors to Go, runnable in production and deterministic tests

Go provides goroutines and channels but leaves ownership of state, full-channel handling, panic recovery and testing to the developer. The lockstep library, an actor runtime for Go, released version 0.2.0 on 1 November 2026 to address these concerns. It offers typed messages, bounded mailboxes, supervision and timers, running actors on a pool of worker goroutines. The same actor code can run under go test in a simulation with its own clock and network, where a seed determines message ordering. The article builds a one-item shop actor that charges a card, reserving stock before the payment call to avoid races between concurrent buyers.