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A general description is here.
Support in ‘tools::Rdiff’ for uncompressed PDF files is further reduced (see its help page): support may be removed entirely in future.
The ‘"lm"’ method for ‘summary()’ now gives the correct F-statistic when the model contains an offset. Reported in PR#18008.
‘tools::Rdiff(useDiff = TRUE)’ checks for the presence of an external ‘diff’ command and switches to ‘useDiff = FALSE’ if none is found.
This allows ‘R CMD Rdiff’ to always work.