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A general description is here.
‘tools::buildVignette()’ and ‘tools::buildVignettes()’ with ‘clean = FALSE’ no longer remove any created files. ‘buildvignette()’ gains a ‘keep’ argument for more cleaning customization.
When ‘attach()’ notices conflicts, it does so compatibly with ‘library()’, emitting a ‘message()’.
‘R CMD Sweave’ no longer cleans any files, compatibly with all previous versions of R.