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A general description is here.
‘str(x)’'s default method is more “accurate” and hence somewhat more generous in displaying character vectors; this will occasionally change R outputs (and need changes to some ‘*.Rout(.save)’ files).
For a classed integer vector such as ‘x <- xtabs(~ c(1,9,9,9))’, ‘str(x)’ now shows both the class and ‘"int"’, instead of only the latter.