This blog is updated daily.
A general description is here.
The non-API header ‘R_ext/R-ftp-http.h’ is no longer provided, as the entry points it covered are now all defunct.
The (non-default and deprecated) ‘method = "internal"’ for ‘download.file’ and ‘url’ no longer supports ‘http://’ nor ‘ftp://’ URIs. (It is used only for ‘file://’ URIs.)
On Windows, ‘download.file(method = "wininet")’ no longer supports ‘ftp://’ URIs. (It is no longer the default method, which is ‘"libcurl"’ and does.)
On Windows, the deprecated ‘method = "wininet"’ now gives a warning for ‘http://’ and ‘https://’ URIs for both ‘download.file’ and ‘url’. (It is no longer the default method.)
‘qnbinom(p, size, mu)’ for large ‘size/mu’ is corrected for a range of
cases (PR#18095); similarly for the ‘(size, prob)’ parametrization of
the negative binomial.
‘qpois()’ and ‘qbinom()’ are better and/or faster for extreme cases.
The underlying C code has been modularized and is common to all four cases of discrete distributions.
On Windows, ‘method = "wininet"’ is deprecated for ‘http://’, ‘https://’ and ‘ftp://’ URIs for both ‘download.file’ and ‘url’. (A warning is only given for ‘ftp://’.)
For ‘ftp://’ URIs the default method is now ‘"libcurl"’ if available (which it is on CRAN builds).
‘method = "wininet"’ remains the default for ‘http://’ and ‘https://’ URIs but if ‘libcurl’ is available, using ‘method = "libcurl"’ is preferred.
‘qnbinom(p, size, mu)’ for large ‘size/mu’ is correct now in a range of cases (PR#18095); similarly for the ‘(size, prob)’ parametrization of the negative binomial. Also ‘qpois()’ and ‘qbinom()’ are better and or faster for extreme cases. The underlying C code has been modularized and is common to all four cases of discrete distributions.
‘gap.axis’ is now part of the ‘axis()’ arguments which are passed from ‘bxp()’, and hence ‘boxplot()’. (Thanks to Martin Smith's report and suggestions in PR#18109.)