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A general description is here.
The unexported low-level functions in package ‘parallel’ for passing serialized R objects to and from forked children now support long vectors on 64-bit platforms. This removes some limits on higher-level functions such as ‘mclapply()’ (but returning gigabyte results from forked processes _via_ serialization should be avoided if at all possible).
‘try()’ gains a new argument ‘outFile’ with a default that can be modified via ‘options(try.outFile = .)’, useful notably for ‘Sweave’.
The radix sort considers ‘NA_real_’ and ‘NaN’ to be equivalent in rank (like the other sort algorithms).
When ‘index.return=TRUE’ is passed to ‘sort.int()’, the radix sort treats ‘NA’s like ‘sort.list()’ does (like the other sort algorithms).
In integer arithmetic, ‘NULL’ is now treated as ‘integer(0)’ whereas it was previously treated as ‘double(0)’.
‘R CMD config’ works better with paths containing spaces, even those of home directories (as reported by Ken Beath).