Merge branch 'add-topo-walk' #10

Job	Run time
lint	3m 50s
cargo-deny (advisories)	30s
installation (win-msvc)	6m 14s
cargo-deny (bans licenses sources)	33s
pure-rust-build	2m 27s
installation (win-gnu)	7m 6s
test	21m 51s
installation (win32-msvc)	8m 37s
test-32bit (armv7-linux-androideabi)	1m 10s
test-fast (windows-latest)	15m 32s
installation (win32-gnu)	8m 34s
WebAssembly (wasm32-unknown-unknown)	55s
test-fast (macos-latest)	4m 58s
WebAssembly (wasm32-wasi)	51s
test-fast (ubuntu-latest)	3m 24s
	1h 26m 32s

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