TASIC - Tokio, Async_STD, Smol, Interface Crate

TASIC provides a general wrapper around the crates Tokio, Async_STD, and Smol to allow libraries providing async code to support them all. Currently, TASIC provides a few functions on its own, instead wrapping original implementations.

TASIC currently only provides functionality for spawning tasks and creating channels, however future expansion is planned, and pull requests are always welcome.