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PCRE has been updated to version 7.9 (for bug fixes).
Outlier symbols drawn by boxplot() now obey the 'outlwd' argument. Reported by Jürgen Kluge.
z^n for integer n and complex z or (numeric z and 2 < |n| <= 256) is more accurate now, notably in the complex case ( if |n| <= 65536).
seq_along(x) is now equivalent to seq_len(length(x)) even where length() has an S3/S4 method; previously it (intentionally) always used the default method for length().
PCRE has been updated to version 7.9 (for bug fixes).
agrep() uses 64-bit ints where available on 32-bit platforms and so may do a better job with complex matches. (E.g. PR#13789, which failed only on 32-bit systems.)
seq_along(x) is now equivalent to seq_len(length(x)); previously it
was not, when x had a "surprising" length() method.
Some extreme cases of pbeta(log.p = TRUE) are more accurate (finite values < -700 rather than -Inf). (PR#13786)
pbeta() now reports on more cases where the asymptotic expansions lose accuracy (the underlying TOMS708 C code was ignoring some of these, including the PR#13786 example).
new.env(hash = TRUE, size = NA) now works, the way it has been documented to for a long time.
tcltk::tk_choose.files(multi = TRUE) produces better-formatted output with filenames containing spaces. (PR#13875)
The C utility function PrintValue no longer attempts to print attributes for CHARSXPs as those attributes are used internally for the CHARSXP cache. This fixes a segfault when calling Rf_PrintValue on a CHARSXP from C code.
srcref records produced by parse() and parse_Rd() did not record the encoding of the source file. (Reported by Romain François.)
gregexpr() no longer segfaults when "" is given as the search pattern. Thanks to Hervé Pagès for the bug report.
CHAR() now returns (const char *) since CHARSXPs should no longer be modified in place. This change allows compilers to warn or error about improper modification. Thanks to Hervé Pagès for the suggestion.