Circuit changes draft #257

Job	Run time
Book tests	1m 18s
Build target wasm32-unknown-unknown	1m 41s
Bitrot check	1m 34s
Build target wasm32-wasi	1m 38s
Intra-doc links	1m 22s
Rustfmt	17s
Test on ubuntu-latest	7m 12s
Test on i686-unknown-linux-gnu	13m 7s
Test on windows-latest	10m 57s
Test on i686-unknown-linux-gnu with beta features	13m 1s
Test on macOS-latest	7m 13s
Test on i686-unknown-linux-gnu with nightly features	15m 22s
Test on ubuntu-latest with beta features	7m 4s
Test on windows-latest with beta features	9m 59s
Test on macOS-latest with beta features	8m 41s
Test on ubuntu-latest with nightly features	8m 6s
Test on windows-latest with nightly features	11m 6s
Test on macOS-latest with nightly features	7m 39s
	2h 7m 17s

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