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der: refactor `Reader::read_nested` #3046

Job	Run time
build (1.72.0, thumbv7em-none-eabi)	35s
minimal-versions	0s
build (1.72.0, wasm32-unknown-unknown)	33s
build (stable, thumbv7em-none-eabi)	26s
build (stable, wasm32-unknown-unknown)	25s
test (1.72.0)	1m 15s
test (stable)	1m 10s
	4m 24s

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