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A general description is here.
‘untar(tar = "internal")’ has some support for ‘pax’ headers as
produced by e.g. ‘gnutar --posix’ or ‘bsdtar --format pax’, including
long path and link names.
The internal method of ‘tar()’ can now store paths too long for the ‘ustar’ format, using the (widely supported) GNU extension.
Local reference classes are a technique for avoiding unneeded copying of large components of objects while retaining standard R functional behavior. See ‘?LocalReferenceClasses’.
‘untar(tar = "internal")’ has some support for ‘pax’ headers as produced by e.g. ‘gnutar --posix’ (which seems prevalent on OpenSUSE 12.2) or ‘bsdtar --format pax’, including long path and link names.