buffer: make methods work on Uint8Array instances #2507

Job	Run time
Build slim tarball	1m 36s
x86_64-darwin: with shared libraries	52m 29s
aarch64-linux: with shared libraries	27m 30s
x86_64-linux: with shared libraries	32m 3s
aarch64-darwin: with shared libraries	37m 6s
	2h 30m 44s

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