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A general description is here.
The long undocumented remapping of ‘rround()’ to ‘Rf_fround()’ in
header ‘Rmath.h’ is now formally deprecated: use ‘fround()’ directly.
The remapping of ‘round()’ to ‘Rf_fround()’ in header ‘Rmath.h’ is
deprecated and may be removed in future.
The long undocumented remapping of ‘rround()’ to ‘Rf_fround()’ in header ‘Rmath.h’ is now formally deprecated: use ‘fround()’ directly.
Remapping of ‘prec()’ and ‘trunc()’ in the ‘Rmath.h’ header has been disabled in C++ code (it has caused breakage with ‘libc++’ headers).
As a result of the 3.0.2 change about ‘the last second before the epoch’, most conversions which should have given ‘NA’ returned that time. (The platforms affected include Linux and OS X, but not Windows nor Solaris.)