Circuit changes draft #217

Job	Run time
Bitrot check	1m 39s
Build target wasm32-unknown-unknown	4m 8s
Book tests	3m 47s
Build target wasm32-wasi	4m 1s
Intra-doc links	3m 52s
Rustfmt	14s
Test on ubuntu-latest	9m 39s
Test on windows-latest	12m 23s
Test on i686-unknown-linux-gnu	16m 2s
Test on i686-unknown-linux-gnu with beta features	15m 57s
Test on macOS-latest	12m 3s
Test on ubuntu-latest with beta features	9m 48s
Test on i686-unknown-linux-gnu with nightly features	17m 28s
Test on windows-latest with beta features	12m 8s
Test on macOS-latest with beta features	13m 8s
Test on ubuntu-latest with nightly features	10m 44s
Test on windows-latest with nightly features	13m 47s
Test on macOS-latest with nightly features	14m 8s
	2h 54m 56s

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