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A general description is here.
‘model.matrix(~1, ...)’ now also contains the same rownames that less trivial formulae produce. (Wist of PR#14992, changes the output of several packages.)
Misuse of ‘rep()’ on undocumented types of objects (e.g. calls) is now reported as an error.
Calling ‘rep()’ or ‘rep.int()’ on a pairlist is deprecated and will give a warning. In any case, ‘rep()’ converted a pairlist to a list so you may as well do that explicitly.
‘model.matrix( ~1, .)’ now also contains the same rownames that less
trivial formulae produce. (PR#14992)
‘pdf(compress = TRUE)’ did not delete temporary files it created until the end of the R session. (PR#14991)