Circuit changes draft #259

Job	Run time
Book tests	1m 20s
Bitrot check	1m 33s
Intra-doc links	1m 25s
Build target wasm32-unknown-unknown	1m 45s
Build target wasm32-wasi	1m 34s
Rustfmt	17s
Test on ubuntu-latest	7m 13s
Test on i686-unknown-linux-gnu	13m 24s
Test on i686-unknown-linux-gnu with beta features	13m 9s
Test on windows-latest	10m 50s
Test on i686-unknown-linux-gnu with nightly features	15m 34s
Test on macOS-latest	7m 30s
Test on ubuntu-latest with beta features	7m 26s
Test on windows-latest with beta features	12m 24s
Test on macOS-latest with beta features	13m 6s
Test on ubuntu-latest with nightly features	8m 8s
Test on windows-latest with nightly features	12m 42s
Test on macOS-latest with nightly features	13m 37s
	2h 22m 57s

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