fixes 682 and 683 #295

Job	Run time
baseline (fedora-clang-17, Release)	11m 48s
baseline (fedora-clang-17, Debug)	9m 16s
baseline (fedora-gnu-13, Release)	12m 7s
baseline (fedora-gnu-13, Debug)	8m 54s
baseline (ubuntu-clang-14, Release)	12m 6s
baseline (ubuntu-clang-14, Debug)	9m 5s
baseline (ubuntu-gnu-11, Release)	10m 48s
baseline (ubuntu-gnu-11, Debug)	8m 51s
baseline (ubuntu-gnu-11, Release, -D CMAKE_CXX_STANDARD=20 -D PRESSIO_ENABLE_CXX20=ON)	12m 9s
baseline (ubuntu-clang-14, Release, -D CMAKE_CXX_STANDARD=20 -D PRESSIO_ENABLE_CXX20=ON)	13m 4s
baseline (fedora-gnu-13, Release, -D CMAKE_CXX_STANDARD=20 -D PRESSIO_ENABLE_CXX20=ON)	12m 25s
baseline (fedora-clang-17, Release, -D CMAKE_CXX_STANDARD=20 -D PRESSIO_ENABLE_CXX20=ON)	13m 27s
	2h 14m 0s

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