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Add long options like --part #2723

Job	Run time
linux-x86_64	2m 1s
linux-x86_64-autotools	1m 35s
linux (i386, i686, i686-linux-gnu, i386-linux-gnu)	1m 21s
linux (armhf, armhf, arm-linux-gnueabihf, arm-linux-gnueabihf)	1m 14s
linux (arm64, aarch64, aarch64-linux-gnu, aarch64-linux-gnu)	1m 15s
macos-x86_64	53s
macos-x86_64-autotools	52s
mingw (mingw64, x86_64)	4m 16s
msvc (x86, Win32)	2m 28s
mingw (ucrt64, ucrt-x86_64)	3m 55s
msvc (x64, x64)	2m 11s
mingw (clang64, clang-x86_64)	3m 2s
msvc (arm64, ARM64)	2m 13s
	27m 16s

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