Address comments from code review. #2481

Job	Run time
Build target wasm32-wasi	3m 56s
Latest build on ubuntu-latest	1m 48s
Latest build on windows-latest	6m 49s
Clippy (MSRV)	4m 26s
Bitrot check	4m 20s
Latest build on macOS-latest	5m 30s
Clippy (beta)	13s
Code coverage	20m 56s
Intra-doc links	4m 55s
protobuf consistency	4m 6s
Rustfmt	11s
Test on ubuntu-latest	12m 49s
UUID validity	5s
Test on ubuntu-latest with --features orchard	12m 52s
Test on ubuntu-latest with --features unstable-nu6	13m 7s
Test on ubuntu-latest with --features zfuture	15m 24s
Test on windows-latest	17m 25s
Test on windows-latest with --features orchard	17m 32s
Test on windows-latest with --features unstable-nu6	20m 2s
Test on windows-latest with --features zfuture	17m 29s
Test on macOS-latest	18m 45s
Test on macOS-latest with --features orchard	21m 7s
	3h 43m 47s

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