fix(derive-encode): Cumulative fixes #921

Job	Run time
Check	1m 40s
Clippy	1m 13s
Check rustdoc intra-doc links	23s
Cross compile (armv7-unknown-linux-gnueabihf)	11s
Rustfmt	12s
Cross compile (powerpc-unknown-linux-gnu)	13s
Test Suite	1m 52s
Cross compile (powerpc64-unknown-linux-gnu)	13s
Cross compile (wasm32-unknown-unknown)	12s
	6m 9s

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