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A general description is here.
‘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.