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A general description is here.
Only font family names starting with ‘"Hershey"’ (and not ‘"Her"’ as before) are given special treatment by the graphics engine.
The minimum preferred version of PCRE has since R 3.0.0 been 8.32 (released in Nov 2012). Versions 8.10 to 8.31 are now deprecated (with warnings fron ‘configure’), but for now still accepted.
The included version of PCRE has been updated to 8.38, a bug-fix release.
‘View()’ now displays nested data frames in a more friendly way. (Request with patch in PR#15915.)
‘"noquote"’ objects may now be used as columns in data frames. (PR#15997)
‘rowsum()’ has more support for matrices and data frames with 2^31 or more elements. (PR#15587)
Matrix indexing of data frames by two-column numeric indices is now supported for replacement as well as extraction.