From what I've read, smol was created by its author and later on adopted by async-std. And, its author was in Tokio team, and later left and was in async-std te

From what I've read, smol was created by its author and later on adopted by async-std. And, its author was in Tokio team, and later left and was in async-std team before he left and created smol. So smol was based on quite deep knowledge and experience in async.