[Rd] wishlist: decreasing argument to is.unsorted

[Patrick Burns]

I've just realized that it could be handy
to have a 'decreasing' argument in 'is.unsorted'.

And I'm cheekily hoping someone else will
implement it.

It is easy enough to work around (with 'rev'),
but would be less hassle with an argument.
The case I have in mind uses 'is.unsorted' in
'stopifnot'.

Pat

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Patrick Burns
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