Code tidy-ups
- add doc comments
- move a couple of methods to be free functions
- fix warnings
- drop unused imports
- drop unnecessary parentheses
- drop unneeded `mut`
- drop unused variables
- `unwrap` results in tests
- error messages
- include original error where possible
- more consistent & terser wording
- consistent leading lowercase letter in error messages
- typos
- comment reflow
Bug: 197891150
Bug: 239476605
Test: build
Change-Id: I53de09af7de23027c9ec7d4ab8e6f610c2cadc3c
10 files changed