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A general description is here.
New function ‘isLoadedNamespace()’ for readability and speed.
The default for option ‘pkgType’ on platforms using binary packages is now ‘"both"’, so source packages will be tried if binary versions are not available or not up to date.
There are options for what ‘install.packages(type = "both")’ will do if compilation of a source package is desirable: see ‘?options’ (under ‘utils’).
If you intend not to accept updates as source packages, you should use ‘update.packages(type = "binary")’.