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A number of changes to reduce copying of objects, contributed by Michael Lawrence.
‘tools::checkFF()’ reports on ‘.C’ and ‘.Fortran’ calls with ‘DUP = FALSE’ if argument ‘check_DUP’ is true. This is selected by ‘R CMD check --as-cran’.
‘available.packages()’ is better protected against corrupt metadata files (A recurring problem on Debian: PR#14713).
‘stripchart()’ again respects reversed limits in ‘xlim’ and ‘ylim’. (PR#15664)