> 'rowsum()' seems to add row names to the resulting matrix, corresponding to
> the respective 'group' values.  This is very handy, but it is not documented.
> Should the documentation mention it so it could be relied upon as part of API?

If you're referring to base::rowSums, the 'value' section of the help page says 
" A numeric or complex array of suitable size, or a vector if the
  result is one-dimensional.  For the first four functions the
  'dimnames' (or 'names' for a vector result) are taken from the
  original array. "

S Ellison

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