Circuit changes draft #255

Job	Run time
Bitrot check	1m 41s
Book tests	1m 19s
Build target wasm32-unknown-unknown	1m 47s
Intra-doc links	1m 21s
Build target wasm32-wasi	1m 34s
Rustfmt	16s
Test on ubuntu-latest	7m 2s
Test on i686-unknown-linux-gnu	13m 10s
Test on windows-latest	10m 46s
Test on macOS-latest	6m 36s
Test on i686-unknown-linux-gnu with beta features	13m 31s
Test on ubuntu-latest with beta features	7m 40s
Test on i686-unknown-linux-gnu with nightly features	15m 1s
Test on windows-latest with beta features	10m 22s
Test on macOS-latest with beta features	12m 33s
Test on ubuntu-latest with nightly features	8m 19s
Test on windows-latest with nightly features	11m 43s
Test on macOS-latest with nightly features	9m 35s
	2h 14m 16s

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