Circuit changes draft #219

Job	Run time
Bitrot check	1m 34s
Book tests	3m 51s
Build target wasm32-unknown-unknown	4m 11s
Build target wasm32-wasi	4m 13s
Intra-doc links	3m 52s
Rustfmt	13s
Test on i686-unknown-linux-gnu	15m 44s
Test on ubuntu-latest	9m 48s
Test on i686-unknown-linux-gnu with beta features	15m 38s
Test on i686-unknown-linux-gnu with nightly features	18m 48s
Test on windows-latest	12m 18s
Test on macOS-latest	18m 55s
Test on ubuntu-latest with beta features	9m 35s
Test on windows-latest with beta features	12m 55s
Test on macOS-latest with beta features	11m 29s
Test on ubuntu-latest with nightly features	10m 35s
Test on windows-latest with nightly features	13m 38s
Test on macOS-latest with nightly features	13m 23s
	3h 0m 40s

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