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Use virtual operators in `vector.h` #5119

Job	Run time
MSVC 4.20	1m 35s
Current MSVC	2m 21s
Current msys2 mingw32	4m 8s
Current msys2 clang32	5m 12s
Download original binaries / fetch	10s
Compare with master	1m 46s
Upload artifacts	0s
	15m 12s

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