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A general description is here.
The (non-default) ‘method = "internal"’ for ‘download.file’ and ‘url’ no longer supports ‘ftp://’ URIs.
Function ‘file_test()’ in package ‘utils’ gains tests for symlinks, reability and writability.
‘matrix(x, n,m)’ now warns in more cases where ‘length(x)’ is larger than ‘n * m’; suggested by Abby Spurdle and Wolfgang Huber in Feb 2021 on the R-devel mailing list.
Using the non-default ‘method = "internal"’ for ‘ftp://’ URIs is deprecated for ‘download.file’ and ‘url’.