async

Uses zsh/zpty to run commands in pseudo-terminals without blocking the shell, eliminating external dependencies as emphasized in the intro.

Prevents multiple instances of the same job from running simultaneously via the -u flag in async_start_worker, reducing duplicate tasks.

Allows registering callbacks to receive detailed job results (name, return code, output, time) through async_process_results, enabling precise job tracking.

Supports creating multiple workers with independent queues via async_start_worker and async_job, facilitating parallel task execution as described in the overview.