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A general description is here.
‘install.packages()’ and ‘download.packages()’ download packages simultaneously using ‘libcurl’, significantly reducing download times when installing or downloading multiple packages.
Status reporting in ‘download.file()’ has been extended to report the outcome for individual files in simultaneous download.
‘smooth.spline()’ checks validity of its arguments ‘df.offset’ and ‘penalty’: it could segfault if they were ‘NULL’.
‘isGeneric(<primitive>, fdef=*, getName=TRUE)’ now also returns the name instead of just ‘TRUE’, fixing PR#18829 reported by Mikael Jagan.