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‘libcurl’ is now required.
Function ‘file_test()’ in package ‘utils’ gains tests for symlinks, readability and writability.
On Windows, ‘download.file(method = "auto")’ and ‘url(method = "default")’ now follow Unix in using ‘"libcurl"’ for all except ‘file://’ URIs.
Setting ‘digits = 0’ in ‘format()’ or ‘options()’ is again invalid. Its behaviour was platform-dependent, and it is unclear what “zero significant digits” should mean (PR#18098).
Using the non-default ‘method = "internal"’ for ‘http://’ and ‘ftp://’ URIs is deprecated for ‘download.file’ and ‘url’.