Merge branch 'improve-backward-compatability-with-zsa' into backward-… #501

Job	Run time
Build target wasm32-unknown-unknown	2m 31s
Book tests	2m 1s
Build target wasm32-wasi	2m 19s
Bitrot check	1m 32s
Intra-doc links	2m 9s
Rustfmt	19s
Test on i686-unknown-linux-gnu	22m 0s
Test on ubuntu-latest	10m 52s
Test on i686-unknown-linux-gnu with beta features	21m 42s
Test on windows-latest	15m 3s
Test on i686-unknown-linux-gnu with nightly features	21m 8s
Test on macOS-latest	8m 58s
Test on ubuntu-latest with beta features	10m 51s
Test on windows-latest with beta features	14m 57s
Test on macOS-latest with beta features	8m 21s
Test on ubuntu-latest with nightly features	11m 8s
Test on windows-latest with nightly features	15m 6s
Test on macOS-latest with nightly features	8m 46s
	2h 59m 43s

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