RE: [sv-ec] Version 9 of the proposal for mantis item 978 was uploaded

Sorry to be nit-picky, but...

(1)
> When a with expression is specified, the
> results of evaluating this expression are used to determine which
> entries of the array are distinct.

In what way?  I assume this means something like

  When a with expression is specified, distinct entries shall be
  those yielding distinct results from that expression.

(2)
> I like Neil's proposal for unique_index().

Indeed, but does the same meaning apply for a with expression in 
this case?  The fact that the effect of "with" is described for
one method but not the other somewhat suggests that it doesn't 
work for .unique_index(); I suspect that's not the intent.

(3)
I assume that the queue returned by .unique() contains *copies*
of the entries in the source array.  It's perhaps not necessary
to say that; but I found the lack of mention unnerving - almost
as if .unique() would *move* entries from the source array to the
result queue.

(4)
Finally, I am not convinced that the word "distinct" has 
a sufficiently specific and transparent meaning here.  If you
know what unique() is supposed to do, the meaning is obvious;
otherwise it may be somewhat vague.  Right now I can't think of
a better way of saying it that doesn't involve a lengthy riff 
about "sets of entries having identical values" or somesuch,
but if I think of something I'll offer it!

-- 
Jonathan Bromley, Consultant

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