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A general description is here.
‘sort.list(x)’ now works for non-atomic objects ‘x’ and ‘method="auto"’ (default) or ‘"radix"’ in cases ‘order(x)’ works.
New function ‘.class2()’ provides the full character vector of class names used for S3 method dispatch.
‘cm.colors(n)’ etc no longer append the code for ‘alpha = 1’, ‘"FF"’, to all colors. Hence all eight ‘*.colors()’ functions and ‘rainbow()’ behave consistently and have the same non-explicit default (PR#17659).
‘readBin()’ and ‘writeBin()’ of a ‘rawConnection()’ now also work in large cases, thanks to a report and proposal by Taeke Harkema in PR#17665.
The ‘plot()’ method for ‘lm’ and ‘glm’ fits, ‘plot.lm()’, gains a new option ‘iter.smooth’ with a default of ‘0’ for glm fits, no longer down-weighting "outliers" when smoothing the residuals. Especially for binary observations with high or low fitted probabilities, this effectively deleted all observations of 1 or 0, respectively. Also, the type of residuals used in the ‘glm’ case has been switched to ‘"pearson"’ since deviance residuals do not in general have approximately zero mean.