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A general description is here.
The ‘print()’ method for ‘POSIXct’ and ‘POSIXlt’ now correctly obeys ‘getOption("max.print")’, fixing a long-standing typo, and it also gets a corresponding optional ‘max’ argument.
‘duplicated(<dataframe with 'f'>)’ now works, too, thanks to Andreas Kersting's PR#17485; ditto for ‘anyDuplicated()’.