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A general description is here.
On Windows, environment variable ‘R_LIBCURL_SSL_REVOKE_BEST_EFFORT’ can be used to switch to only best effort revocation checks with the default ‘"libcurl"’ download method. This reduces security, but may be needed for downloads to work with MITM proxies (PR#18379).
‘tools::Rdiff(useDiff = TRUE)’ checks for the presence of an external ‘diff’ command and switches to ‘useDiff = FALSE’ if none is found. This allows ‘R CMD Rdiff’ to always work.
‘write.table’, ‘write.csv’ and ‘write.csv2’ restore their numerical precision (internal equivalent of ‘digits = 15’) after an interrupt (PR#18384).