Tests

docs: better docs for `Encode` and `Decode` #1443

Job	Run time
no-std build	47s
WASM tests	3m 53s
Unix tests (ubuntu-latest, stable)	2m 4s
Unix tests (ubuntu-latest, nightly)	1m 50s
Windows tests (stable, x86_64-pc-windows-gnu)	4m 48s
Unix tests (macos-13, stable)	4m 22s
Unix tests (macos-13, nightly)	3m 52s
Windows tests (stable, x86_64-pc-windows-msvc)	3m 59s
Unix tests (macos-14, stable)	1m 56s
Windows tests (nightly, x86_64-pc-windows-gnu)	5m 10s
Unix tests (macos-14, nightly)	1m 38s
Windows tests (nightly, x86_64-pc-windows-msvc)	3m 39s
	37m 58s

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