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A general description is here.
‘Sys.timezone()’ on a Unix-alike caches the value at first use in a session: _inter alia_ this means that setting ‘TZ’ later in the session affects only the _current_ time zone and not the _system_ one.
‘Sys.timezone()’ is now used to find the system timezone to pass to the code used when R is configured with ‘--with-internal-tzcode’.
‘str(x)’ for atomic objects ‘x’ now treats both cases of ‘is.vector(x)’ similarly, and hence much less often prints ‘"atomic"’. This is a slight non-back-compatible change producing typically both more informative and shorter output.
The version of LAPACK included in the sources has been updated to 3.8.0 (for the routines used by R a very minor bug-fix change).