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What's new in this version:

C-LEVEL FACILITIES:
- The workaround in headers R.h and Rmath.h (using namespace std;) for the Oracle Developer Studio compiler is no longer needed now C++11 is required so has been removed. A couple more usages of log() (which should have been std::log()) with an int argument are reported on Solaris
- The undocumented limit of 4095 bytes on messages from the S-compatibility macros PROBLEM and MESSAGE is now documented and longer messages will be silently truncated rather than potentially causing segfaults
- If the R_NO_SEGV_HANDLER environment variable is non-empty, the signal handler for SEGV/ILL/BUS signals (which offers recovery user interface) is not set. This allows more reliable debugging of crashes that involve the console

Deprecated and defunct:
- The legacy S-compatibility macros PROBLEM, MESSAGE, ERROR, WARN, WARNING, RECOVER, ... are deprecated and will be hidden in R 4.2.0. R's native interface of Rf_error and Rf_warning has long been preferred

Fixed:
- .mapply(F, dots, .) no longer segfaults when dots is not a list and uses match.fun(F) as always documented
- Hist(<Date>, ...) and hist(<POSIXt>, ...) no longer pass arguments for rect() (such as col and density) to axis().
- Sexpr{ch} now preserves Encoding(ch)
- Setting the RNG to "Marsaglia-Multicarry" e.g., by RNGkind(), now warns in more places
- Gray(numeric(), alpha=1/2) no longer segfaults
- Fixed dnbinom(x, size=<very_small>, .., log=TRUE) regression
- As.Date.POSIXlt(x) now keeps names(x)
- Model.response() now strips an "AsIs" class typically
- Try() is considerably faster in case of an error and long call, as e.g., from some do.call()
- Qqline(y = <object>) such as y=I(.), now works
- Non-integer mgp par() settings are now handled correctly in axis() and mtext()
- FormatC(x) returns length zero character() now, rather than "" when x is of length zero, as documented
- RemoveSource(fn) now retains (other) attributes(fn)