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New ‘anyNA()’ is a fast version of ‘any(is.na(.))’, based on a proposal by Tim Hesterberg. (Wish of PR#15239).
On system where ‘mktime()’ does not set ‘ERRNO’, the last second before the epoch could not be converted from ‘POSIXlt’ to ‘POSIXct’. (Reported by Bill Dunlap).