Apply suggestions from code review #2564

Job	Run time
Bitrot check	4m 24s
Clippy (MSRV)	4m 57s
Build target wasm32-wasi	4m 11s
Latest build on ubuntu-latest	1m 58s
Clippy (beta)	16s
Latest build on windows-latest	4m 22s
Latest build on macOS-latest	3m 11s
Code coverage	20m 33s
Intra-doc links	5m 6s
Rustfmt	12s
protobuf consistency	4m 27s
UUID validity	3s
Test on ubuntu-latest	12m 49s
Test on ubuntu-latest with --features orchard	13m 13s
Test on ubuntu-latest with --features unstable-nu6	13m 26s
Test on ubuntu-latest with --features zfuture	13m 10s
Test on windows-latest	17m 46s
Test on windows-latest with --features orchard	17m 48s
Test on windows-latest with --features unstable-nu6	17m 58s
Test on windows-latest with --features zfuture	18m 8s
Test on macOS-latest	17m 41s
Test on macOS-latest with --features orchard	19m 36s
	3h 35m 15s

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