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A general description is here.
‘::’ can now be used for datasets made available for lazy-loading in packages with namespaces (which makes it consistent with its use for data-only packages without namespaces in earlier versions of R).
‘mem.limits()’ is now deprecated: these limits are nowadays almost never used, and are reported by ‘gc()’ when they are in use.
Forms like ‘binomial(link=link)’ for GLM families deprecated since R 2.4.0 are now defunct.