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A general description is here.
As an experimental feature, when codeloadNamespace fails because the requested package is not available the error is initially signaled with a ‘retry_loadNamespace’ restart available. This allows a calling handler to try to install the package and continue.
‘var(f)’ and hence ‘sd(f)’ now give an error for ‘factor’ arguments; they gave a warning since R 3.2.3, PR#16564.
‘next(n)’ now also works for larger ‘n’ and no longer loops infinitely for e.g, ‘n <- 214e7’.