Circuit changes draft #227

Job	Run time
Bitrot check	1m 30s
Book tests	3m 56s
Build target wasm32-unknown-unknown	4m 39s
Intra-doc links	3m 58s
Build target wasm32-wasi	4m 5s
Rustfmt	15s
Test on i686-unknown-linux-gnu	16m 21s
Test on ubuntu-latest	10m 18s
Test on i686-unknown-linux-gnu with beta features	16m 0s
Test on windows-latest	12m 31s
Test on i686-unknown-linux-gnu with nightly features	17m 35s
Test on macOS-latest	11m 56s
Test on ubuntu-latest with beta features	9m 38s
Test on windows-latest with beta features	12m 26s
Test on macOS-latest with beta features	10m 51s
Test on ubuntu-latest with nightly features	10m 53s
Test on windows-latest with nightly features	13m 47s
Test on macOS-latest with nightly features	12m 45s
	2h 53m 24s

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