perf: improve decode method #47

Job	Run time
Build FreeBSD	11m 13s
stable - x86_64-apple-darwin - node@18	1m 42s
stable - x86_64-pc-windows-msvc - node@18	4m 51s
stable - i686-pc-windows-msvc - node@18	4m 35s
stable - x86_64-unknown-linux-gnu - node@18	2m 39s
stable - aarch64-apple-darwin - node@18	2m 31s
stable - armv7-unknown-linux-gnueabihf - node@18	1m 44s
stable - aarch64-linux-android - node@18	1m 38s
stable - aarch64-pc-windows-msvc - node@18	4m 57s
Build universal macOS binary	36s
Test bindings on armv7-unknown-linux-gnueabihf - node@14	1m 3s
Test bindings on armv7-unknown-linux-gnueabihf - node@16	44s
Test bindings on armv7-unknown-linux-gnueabihf - node@18	1m 16s
Test bindings on Linux-x64-gnu - node@14	23s
Test bindings on Linux-x64-gnu - node@16	19s
Test bindings on Linux-x64-gnu - node@18	29s
Test bindings on x86_64-pc-windows-msvc - node@14	2m 18s
Test bindings on x86_64-pc-windows-msvc - node@16	45s
Test bindings on x86_64-pc-windows-msvc - node@18	53s
Publish	30s
	45m 6s

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