fix(derive-encode): Cumulative fixes #922

Job	Run time
Cross compile (armv7-unknown-linux-gnueabihf)	10s
Clippy	1m 11s
Cross compile (powerpc-unknown-linux-gnu)	16s
Check rustdoc intra-doc links	31s
Cross compile (powerpc64-unknown-linux-gnu)	17s
Check	1m 28s
Rustfmt	10s
Test Suite	1m 43s
Cross compile (wasm32-unknown-unknown)	9s
	5m 55s

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