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A general description is here.
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.