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A general description is here.
The main HTML help page now links to this NEWS file. (Suggested by Henrik Bengtsson.) Package index files link to a list of demos when using dynamic help.
The [ method for class "AsIs" allows the next method to change the underlying class. (Wish of Jens Oehlschlägel.)
write.csv[2] no longer allow 'append' to be changed.
complete.cases() failed on a 0-column data frame argument. (Underlies PR#14066.)
An error in nls() with a long formula could cause a segfault. (PR#14059)
qnchisq(p, df, ncp, lower.tail = FALSE) with ncp >= 80 was inaccurate for small p (as the help page said): it is now less inaccurate.
pPrinting ls.str() resultsresults from ls.str() no longer evaluates unevaluated calls.