Apply suggestions from code review #2523

Job	Run time
Bitrot check	4m 29s
Build target wasm32-wasi	4m 31s
Clippy (MSRV)	4m 35s
Latest build on ubuntu-latest	1m 49s
Latest build on windows-latest	3m 58s
Clippy (beta)	18s
Code coverage	20m 59s
Latest build on macOS-latest	2m 50s
Intra-doc links	5m 17s
Rustfmt	20s
UUID validity	6s
protobuf consistency	4m 17s
Test on ubuntu-latest	13m 22s
Test on ubuntu-latest with --features orchard	13m 1s
Test on ubuntu-latest with --features unstable-nu6	13m 5s
Test on ubuntu-latest with --features zfuture	13m 8s
Test on windows-latest	18m 15s
Test on windows-latest with --features orchard	18m 35s
Test on windows-latest with --features unstable-nu6	18m 11s
Test on windows-latest with --features zfuture	17m 53s
Test on macOS-latest	19m 7s
Test on macOS-latest with --features orchard	19m 39s
	3h 37m 45s

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