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A general description is here.
arrows() and segments() allow one of x1 or y1 to be omitted to simplify the specification of vertical or horizontal lines (suggestion of Tim Hesterberg).
approxfun() is faster by avoiding repeated NA checks (diagnosis and patch by Karline Soetaert & Thomas Petzoldt).
Logic operations with complex numbers now work, as they were always documented to, and as in S.
order() was missing a PROTECT() call and so could segfault when called on character data under certain (rare) circumstances involving marked non-native encodings.
R_ReplDLLinit() initializes the top-level jump so that embedding some embedded applications on Windows no longer crash on error.
ATrying to assigning into a raw vector with an index vector containing NAs could cause a segfault. Reported by Hervé Pagès.
Rscript wcould segfault if (by user error) its filename argument was not providedmissing. Reported by Martin Morgan.
getAnywhere() (and functions that use it, including argument completion in the console) did not handle special built-in functions properly. Reported by Romain Francois.