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A general description is here.
‘strwrap()’ converts inputs with a marked encoding to the current locale: previously it made some attempt to pass through as bytes inputs invalid in the current locale.
‘file.copy(recursive = TRUE)’ has some additional checks on user error leading to attempted infinite recursion (and on some platforms to crashing R).
‘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.