build

delete: reinstantiate the original -f behaviour #794

Job	Run time
build asan+lsan ubuntu-24.04 clang-18	2m 2s
build ubsan+tsan macos-latest clang-19	12m 27s
build ubsan+tsan ubuntu-24.04 clang-18	4m 14s
build ubuntu-24.04 clang-18	1m 56s
build macos-latest clang-19	2m 33s
	23m 12s

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