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A general description is here.
Where methods for ‘length()’ return a double value which is representable as an integer (as often happens for package ‘Matrix’), this is converted to an integer.
Matrix indexing of dataframes by two-column numeric indices is now supported for replacement as well as extraction.
The parser now incorporates code from Romain Francois' ‘parser’ package, to support more detailed computation on the code, such as syntax highlighting, comment-based documentation, etc. Functions ‘getParseData()’ and ‘getParseText()’ access the data.
‘sample.int()’ has some support for n >= 2^31: see its help for the limitations.
A different algorithm is used for ‘(n, size, replace = FALSE, prob = NULL)’ for ‘n > 1e7’ and ‘size <= n/2’. This is much faster and uses less memory, but does give different results.