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A general description is here.
The DVI/PDF reference manual now includes the help pages for all the standard packages: ‘splines’, ‘stats4’ and ‘tcltk’ were previously omitted.
In a reference class S4 method, ‘callSuper()’ now works in ‘initialize()’ methods when there is no explicit superclass method.
‘!’ dropped attributes such as names and dimensions from a length-zero arguemnt. (PR#14424)
‘promptClass()’ in package ‘methods’ now works for reference classes and gives a suitably specialized skeleton of documentation.
Also, ‘callSuper()’ now works via the ‘methods()’ invocation as well as for initially specified methods.