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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, 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 top-level jump so that
embedding applications on Windows no longer crash on error.
Assign ing into a raw vector with an index vector containing NAs
would segfault if its filename argument was not provided. 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.