st: bug in -xtile-

["Dr. Yu Chen" <profyuchen@gmail.com>]

I think there is a bug in -xtile-. I ran the code below, and I still
got deciles, but they are incomplete. I would expect missing values
because there are not enough observations.
I use Stata 12.

sysuse auto,clear
keep in 1/10
xtile decile=price if price<5000, nq(10)
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