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A general description is here.
‘simplify2array()’ gains an ‘except’ argument for controlling the exceptions used by ‘sapply()’.
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.)
‘make check’ now works also without a LaTeX installation. (Thanks to Sebastian Meyer's PR#18103.)