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A general description is here.
‘file.copy(recursive = TRUE)’ has some additional checks on user error leading to attempted infinite recursion (and on some platforms to crashing R).
‘install.packages(type = "both")’ has been enhanced. In interactive use it will ask whether to choose the source version of a package if the binary version is older and contains compiled code, and also asks if source packages with no binary version should be installed).
‘logLik()’ did not detect the error of applying it to a multiple-response linear model. (PR#15000)
‘file.copy(recursive = TRUE)’ did not always report ‘FALSE’ for a failure two or more directories deep.