* Introduce parallel-compilation configuration switch * Plumb parallel_compilation config to compilation * Adjust obj.rs * Address review * Fix compilation fail in `cache` crate * Fix obj.rs Also remove the now unneeded feature in /Cargo.toml * fmt
* Introduce parallel-compilation configuration switch * Plumb parallel_compilation config to compilation * Adjust obj.rs * Address review * Fix compilation fail in `cache` crate * Fix obj.rs Also remove the now unneeded feature in /Cargo.toml * fmt