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Fix 10 correctness defects found by SME review of the v0.3.1 binary #33

Job	Run time
cargo audit + deny	4m 55s
test (tui)	2m 19s
clippy	1m 6s
release build (macos-latest)	1m 48s
release build (ubuntu-latest)	1m 30s
test (default-features)	1m 53s
test (no-default)	1m 41s
rustfmt	8s
release build (windows-latest)	2m 42s
MSRV (rust-version) build	1m 54s
	19m 56s