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A general description is here.
‘duplicated()’, ‘unique()’, and ‘anyDuplicated()’ now also work for class ‘expression’ vectors.
New function ‘use()’ to use packages in R scripts with full control over what gets added to the search path. (Actually already available since R 4.4.0.)
‘seq.Date(from, to, by, ....)’ and ‘seq.POSIXt(..)’ now also work when ‘from’ is missing and sufficient further arguments are provided, thanks to Michael Chirico's report, patch proposal in PR#17672 and ‘R Dev Day’ contributions.
The ‘Date’ method also works for ‘seq(from, to)’, when ‘by’ is missing and now defaults to ‘"1 days"’.
It is now documented (and tested) that the ‘by’ string may be _abbreviated_ in both ‘seq’ methods.
Both methods return or keep internal type ‘"integer"’ more consistently now. Also, ‘as.POSIXct({})’ is internally integer.