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A general description is here.
R CMD INSTALL has a new option --data-compress to control the compression used when lazy-loading data.
One new option is --data-compress=bzip2 which will give ca 15% better compression at the expense of slower installation times . Also --data-compress=xz, often giving even better compression on large datasets at the expense of much longer installation times.
file() for open = "", "r" or "rt" will automagically detect compressed files (from gzip, bzip2 or xv). This means that compressed files can be specified by file name
to read.table(), readlines(), scan() and so on.
The 'type' argument of index.search() is deprecated: there are
Having a version of 'tar' capable of automagically detecting compressed archives is useful for utils::untar(), and so 'gtar' (a common name for GNU tar) is preferred to 'tar': set environment variable TAR to specify a particular 'tar' command.
R CMD replaced TEXINPUTS rather than appending to it (as documented and intended).