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A general description is here.
(C-level Native routine registration.) The deprecated ‘styles’ component of ‘R_CMethodDef’ and ‘R_FortranMethodDef’ no longer does anything. (It should not be initialized in those structures as the component will be remvoed in the future.)
The ‘str()’ and ‘as.hclust()’ methods for ‘"dendrogram"’ now also work for deeply nested dendrograms thanks to non-recursive implementations by Bradley Broom.