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A general description is here.
‘vector()’ and its wrappers such as ‘integer()’ and ‘double()’ now warn if called with a ‘length’ argument of more than one element. This helps track down user errors such as calling ‘double(x)’ instead of ‘as.double(x)’.
‘addmargins()’ called ‘numeric(apos)’ rather than ‘numeric(length(apos))’.