Circuit changes draft #268

Job	Run time
Book tests	1m 31s
Bitrot check	1m 42s
Build target wasm32-unknown-unknown	1m 48s
Intra-doc links	1m 31s
Build target wasm32-wasi	1m 44s
Rustfmt	14s
Test on ubuntu-latest	7m 18s
Test on i686-unknown-linux-gnu	13m 11s
Test on windows-latest	10m 2s
Test on i686-unknown-linux-gnu with beta features	13m 48s
Test on i686-unknown-linux-gnu with nightly features	15m 29s
Test on macOS-latest	10m 8s
Test on ubuntu-latest with beta features	7m 15s
Test on windows-latest with beta features	11m 26s
Test on macOS-latest with beta features	14m 27s
Test on ubuntu-latest with nightly features	8m 19s
Test on windows-latest with nightly features	12m 9s
Test on macOS-latest with nightly features	9m 30s
	2h 21m 32s

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