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A general description is here.
R can now optionally be compiled to use reference counting instead of
the ‘NAMED’ mechanism by defining ‘SWITCH_TO_REFCNT’. This may become
the default in the future.
‘file.path()’ removes any trailing separator on Windows, where it invalid (although sometimes accepted). This is intended to enhance the portability of code written by those using POSIX file systems (where a trailing ‘/’ can be used to confine path matching to directories).
R can now optionally be compiled to use reference counting instead of the ‘NAMED’ mechanism by defining ‘SWITCH_TO_REFCNT’ in ‘Rinternals.h’. This may become the default in the future.