fix: remove unnecessary Sized boundaries (#274) #936

Job	Run time
Check	1m 52s
Clippy	1m 13s
Rustfmt	15s
Check rustdoc intra-doc links	26s
Cross compile (powerpc-unknown-linux-gnu)	16s
Cross compile (armv7-unknown-linux-gnueabihf)	12s
Cross compile (wasm32-unknown-unknown)	16s
Cross compile (powerpc64-unknown-linux-gnu)	25s
Test Suite	1m 54s
	6m 49s

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