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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).
‘R CMD check --as-cran’ set ‘_R_CHECK_TIMINGS_’ too late to have the intended effect.
‘write.table()’, ‘write.csv()’ and ‘write.csv2()’ restore their numerical precision (internal equivalent of ‘digits = 15’) after an interrupt (PR#18384).