various improvements #5493

Job	Run time
pure-rust-build	1m 56s
test	10m 26s
test-32bit	5m 36s
test-32bit-cross (armv7-linux-androideabi)	1m 5s
test-fast (windows-latest)	14m 38s
test-fixtures-windows	15m 40s
test-fast (macos-latest)	4m 4s
test-journey	4m 15s
test-fast (ubuntu-latest)	3m 41s
cargo-deny	30s
cargo-deny-advisories	28s
check-blocking	4s
check-packetline (ubuntu-latest)	6s
lint	3m 51s
WebAssembly (wasm32-unknown-unknown)	1m 12s
WebAssembly (wasm32-wasip1)	43s
Tests pass	1s
	1h 8m 16s

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