Circuit changes draft #231

Job	Run time
Book tests	2m 4s
Bitrot check	1m 23s
Build target wasm32-unknown-unknown	2m 36s
Build target wasm32-wasi	2m 17s
Intra-doc links	2m 16s
Rustfmt	11s
Test on ubuntu-latest	8m 0s
Test on i686-unknown-linux-gnu	14m 1s
Test on windows-latest	10m 22s
Test on i686-unknown-linux-gnu with beta features	14m 49s
Test on macOS-latest	8m 35s
Test on i686-unknown-linux-gnu with nightly features	16m 30s
Test on ubuntu-latest with beta features	8m 12s
Test on windows-latest with beta features	10m 33s
Test on macOS-latest with beta features	7m 49s
Test on ubuntu-latest with nightly features	9m 4s
Test on windows-latest with nightly features	11m 37s
Test on macOS-latest with nightly features	14m 59s
	2h 25m 18s

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