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‘as<-()’ avoids an infinite loop when a virtual class comes between a
subclass and an actual superclass.
Fix level propagation in ‘unlist()’ when the list contains zero-length
lists or factors.
Fix S3 dispatch on S4 objects when the ‘methods’ package is not
Internal S4 dispatch sets ‘.Generic’ in the method frame for
consistency with ‘standardGeneric()’ (PR#16929).
Fix ‘order(x, decreasing=TRUE)’ when ‘x’ is an integer vector
containing ‘MAX_INT’. Ported from a fix Matt Dowle made to