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A general description is here.
‘pairs()’ gains new arguments to select sets of variables to be plotted against each other.
There is some support for testing the ‘\dontrun’. and ‘\donttest’ parts of examples in packages.
‘tools::testInstalledPackage()’ accepts new arguments ‘commentDontrun = FALSE’ and ‘commentDonttest = FALSE’.
‘R CMD check’ gains ‘--run-dontrun’ and ‘--run-donttest’ options.
(Windows ‘Rgui’ console.) Unbuffered output was sometimes not output immediately if the prompt was not on the last line of the console.
The built-in help server did not declare the encoding for the ‘DESCRIPTION’ or other text files to be the package encoding, so non-ASCII characters could be displayed incorrectly.