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‘R CMD check --as-cran’ has a workaround for a bug in versions of ‘file’ up to at least 5.41 which mis-identify 2022 DBF files as executables.
‘R CMD check --use-valgrind’ also uses ‘valgrind’ when re-building vignettes as some non-Sweave vignettes unhelpfully comment out all their code when ‘R CMD check’ runs vignettes.