joint arrays' buckets #3426

Job	Run time
macos/clang++/c++17	11m 47s
macos/clang++/c++17	11m 47s
buster/g++/c++17/asan=off/ubsan=off	26m 19s
buster/g++/c++17/asan=off/ubsan=off	26m 19s
focal/clang++/c++17/asan=off/ubsan=on	25m 26s
focal/clang++/c++17/asan=off/ubsan=on	25m 26s
focal/g++-10/c++20/asan=on/ubsan=off	31m 32s
focal/g++-10/c++20/asan=on/ubsan=off	31m 19s
jammy/g++/c++20/asan=on/ubsan=off	30m 5s
jammy/g++/c++20/asan=on/ubsan=off	30m 5s
	4h 10m 5s

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