This is a walkthrough on the proposal of Error Values to confirm whether the proposal is enough functional to fix issue 18183.
As described in issue 18183, the kernel of the issue is error observability on a function that interacts with multiple external processes concurrently because the returned error values could be mapped values of external processes' faults. Without error observability, it's hard to understand what the error values really mean and the circumstances really are.
- The new proposed features inspection and printing work fine.