Tests

docs: better docs for `Encode` and `Decode` #1439

Job	Run time
no-std build	49s
Unix tests (ubuntu-latest, stable)	13m 37s
WASM tests	3m 55s
Unix tests (ubuntu-latest, nightly)	13m 39s
Unix tests (macos-13, stable)	13m 38s
Windows tests (stable, x86_64-pc-windows-gnu)	4m 54s
Windows tests (stable, x86_64-pc-windows-msvc)	15m 57s
Unix tests (macos-13, nightly)	13m 37s
Windows tests (nightly, x86_64-pc-windows-gnu)	5m 58s
Unix tests (macos-14, stable)	13m 42s
Windows tests (nightly, x86_64-pc-windows-msvc)	15m 51s
Unix tests (macos-14, nightly)	13m 41s
	2h 9m 18s

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