various improvements #5599

Job	Run time
cargo-deny	32s
cargo-deny-advisories	31s
check-blocking	3s
check-packetline (ubuntu-latest)	7s
lint	3m 54s
pure-rust-build	2m 3s
test	11m 13s
test-32bit (i386)	5m 59s
test-fast (windows-latest)	15m 24s
test-32bit (arm32v7)	4m 17s
test-fast (macos-latest)	4m 10s
test-fast (ubuntu-latest)	3m 49s
test-fixtures-windows	15m 2s
test-fast (ubuntu-22.04-arm)	4m 44s
test-journey	3m 55s
WebAssembly (wasm32-unknown-unknown)	1m 7s
WebAssembly (wasm32-wasip1)	41s
Tests pass	1s
	1h 17m 32s

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