Circuit changes draft #435

Job	Run time
Bitrot check	1m 33s
Book tests	1m 20s
Build target wasm32-unknown-unknown	1m 48s
Build target wasm32-wasi	1m 34s
Intra-doc links	1m 25s
Rustfmt	16s
Test on ubuntu-latest	7m 15s
Test on windows-latest	10m 45s
Test on i686-unknown-linux-gnu	13m 36s
Test on macOS-latest	5m 49s
Test on ubuntu-latest with beta features	7m 12s
Test on i686-unknown-linux-gnu with beta features	13m 46s
Test on windows-latest with beta features	10m 1s
Test on i686-unknown-linux-gnu with nightly features	15m 47s
Test on macOS-latest with beta features	6m 34s
Test on ubuntu-latest with nightly features	8m 10s
Test on windows-latest with nightly features	12m 1s
Test on macOS-latest with nightly features	7m 3s
	2h 5m 55s

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