Circuit changes draft #225

Job	Run time
Bitrot check	1m 29s
Build target wasm32-unknown-unknown	4m 16s
Build target wasm32-wasi	4m 5s
Test on ubuntu-latest	9m 37s
Test on i686-unknown-linux-gnu	15m 43s
Test on windows-latest	12m 36s
Test on i686-unknown-linux-gnu with beta features	15m 42s
Test on macOS-latest	10m 41s
Test on ubuntu-latest with beta features	10m 3s
Test on i686-unknown-linux-gnu with nightly features	17m 52s
Book tests	4m 1s
Test on windows-latest with beta features	12m 32s
Test on macOS-latest with beta features	11m 27s
Intra-doc links	3m 58s
Test on ubuntu-latest with nightly features	10m 39s
Rustfmt	13s
Test on windows-latest with nightly features	13m 43s
Test on macOS-latest with nightly features	11m 56s
	2h 50m 33s

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