OrchardZSA backward compatability using traits #465

Job	Run time
Bitrot check	1m 30s
Build target wasm32-unknown-unknown	2m 9s
Book tests	1m 49s
Build target wasm32-wasi	2m 3s
Rustfmt	20s
Intra-doc links	1m 55s
Test on ubuntu-latest	11m 4s
Test on i686-unknown-linux-gnu	22m 50s
Test on windows-latest	14m 4s
Test on i686-unknown-linux-gnu with beta features	23m 33s
Test on macOS-latest	9m 53s
Test on i686-unknown-linux-gnu with nightly features	23m 59s
Test on ubuntu-latest with beta features	11m 8s
Test on windows-latest with beta features	14m 56s
Test on macOS-latest with beta features	9m 16s
Test on ubuntu-latest with nightly features	11m 21s
Test on windows-latest with nightly features	14m 37s
Test on macOS-latest with nightly features	9m 14s
	3h 5m 41s

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