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New ‘summary()’ method for ‘warnings()’ with a (somewhat experimental) ‘print()’ method.
The S4 methods on ‘Ops()’ for the ‘"structure"’ class no longer cause infinite recursion when the structure is not an S4 object.
‘nlm(f, ..)’ for the case where ‘f()’ has a ‘"hessian"’ attribute now computes LL' = H + µI correctly, (part 1 of PR#17249).
An S4 method that “rematches” to its generic and overrides the default value of a generic formal argument to ‘NULL’ no longer drops the argument from its formals.