OrchardZSA backward compatability using traits #483

Job	Run time
Test on ubuntu-latest	10m 43s
Test on windows-latest	14m 19s
Bitrot check	1m 27s
Test on macOS-latest	8m 48s
Book tests	1m 57s
Test on ubuntu-latest with beta features	10m 40s
Build target wasm32-unknown-unknown	2m 23s
Build target wasm32-wasi	2m 12s
Intra-doc links	2m 0s
Test on windows-latest with beta features	14m 53s
Rustfmt	16s
Test on macOS-latest with beta features	8m 14s
Test on i686-unknown-linux-gnu	21m 25s
Test on ubuntu-latest with nightly features	10m 48s
Test on i686-unknown-linux-gnu with beta features	20m 53s
Test on windows-latest with nightly features	14m 28s
Test on i686-unknown-linux-gnu with nightly features	22m 16s
Test on macOS-latest with nightly features	8m 39s
	2h 56m 21s

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