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block-buffer: replace `ReadBuffer::read` method with `read_cached` an… #776

Job	Run time
build (1.85.0, thumbv7em-none-eabi)	19s
build (stable, thumbv7em-none-eabi)	18s
build (1.85.0, wasm32-unknown-unknown)	20s
build (stable, wasm32-unknown-unknown)	31s
test (stable)	16s
test (1.85.0)	14s
minimal-versions / minimal-versions	25s
	2m 23s

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