Clarify difference in FP representation #7830

Job	Run time
build (windows-2019, Win32, v142, 17, Debug)	1m 23s
build (windows-2019, Win32, v142, 17, Release)	2m 26s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 25s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 14s
build (windows-2019, x64, v141, 14, Debug)	1m 21s
build (windows-2019, x64, v141, 14, Release)	2m 21s
build (windows-2019, x64, v141, 17, Debug)	1m 36s
build (windows-2019, x64, v141, 17, Release)	2m 23s
build (windows-2019, x64, v142, 17, Debug)	1m 12s
build (windows-2019, x64, v142, 17, Release)	2m 26s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 50s
mingw (mingw64)	3m 47s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 14s
mingw (ucrt64)	3m 55s
build (windows-2019, x64, v142, 20, Debug)	1m 30s
build (windows-2019, x64, v142, 20, Release)	3m 12s
build (windows-2022, x64, v143, Debug, 20)	1m 50s
	37m 5s

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