[Rd] Inconsistency between row and nrow

[Gabor Grothendieck]

In the following nrow provides the expected result but row gives an
error.  I would have thought that they would both work or both fail.

  aa <- array(dim = 5:3)

  nrow(aa)
  ## [1] 5

  row(aa)
  ## Error in row(aa) : a matrix-like object is required as argument to 'row'

  # this does work:
  slice.index(aa, 1)

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