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A general description is here.
‘model.frame()’ produces more informative error messages in some cases when variables in the formula are not found, thanks to Ben Bolker's PR#18860.
‘selectMethod(f, ..)’ now keeps the function name if the function belongs to of a group generic and the method is for the generic.
Setting ‘attributes’ on primitive functions is deprecated now and already an error in the development version of R.