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A general description is here.
‘Writing R Extensions’ now mentiones the macros ‘MAYBE_REFERENCED’, ‘MAYBE_SHARED’, and ‘MARK_NOT_MUTABLE’ that should be used by package ‘C’ code instead ‘NAMED’ or ‘SET_NAMED’.
If the option ‘setWidthOnResize’ is set and ‘TRUE’, R run in a terminal using a recent ‘readline’ library will set the ‘width’ option when the terminal is resized. Suggested by Ralf Goertz.
If multiple ‘on.exit’ epressions are set using ‘add = TRUE’ then all expressions will now be run even if one signals an error.