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A general description is here.
approxfun() and approx() now accept a 'rule' of length two, for easy specification of different interpolation rules on left and right. They also
They no longer segfault for invalid zero-length specification of 'yleft, 'yright', or 'f'.
gsub() in a non-UTF-8 locale with a marked UTF-8 input could in rare circumstances overrun a buffer and so segfault.