FutoIn AsyncSteps

FutoIn AsyncSteps mimics traditional threads of execution in a single-threaded event loop, supporting cancellation, exit handlers, thread-local storage, and synchronization primitives like mutexes and throttles. Current stable version is 2.5.6, released under a stable maturity (status 3). It builds on the FTN12: FutoIn Async API v1.13 specification. Key differentiators include explicit step-based control flow (add, parallel, error handling) rather than Promises or async/await, though it integrates with Promises via as.await(). It is designed for both Node.js (>=8) and browser environments, providing ES5 CJS modules under es5/ and pre-built webpack dists under dist/. Synchronization primitives like Mutex are available for coordinated concurrent execution.