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A general description is here.
‘packageStatus()’'s ‘upgrade()’ method no longer ignores its ‘...’ argument but passes it to ‘install.packages()’.
‘installed.packages()’ gains a ‘...’ argument to allow arguments (including ‘noCache’) to be passed from ‘new.packages()’, ‘old.packages()’, ‘update.packages()’ and ‘packageStatus()’.
‘factor(x, levels, labels)’ now allows duplicated ‘labels’ (not duplicated ‘levels’!). Hence you can map different values of ‘x’ to the same level directly.
No longer emit a warning when attempting to use ‘names<-()’ on an S4 derivative of a basic type.
‘available.packages()’ has two new arguments which control if the values from the per-session repository cache are used (default true, as before) and if so how old cached values can be to be used (default one hour).
These arguments can be passed from ‘install.packages()’, ‘update.packages()’ and functions calling that: to enable this ‘available.packages()’, ‘packageStatus()’ and ‘download.file()’ gain a ‘...’ argument.
‘object.size()’ now also works for long vectors.
Reinitialize the connection buffer when reopening a connection.