Add ui.strict config item. This turns off command matching by unambiguous prefix, and is a good thing if you want to write future-proof scripts. This fixes issue 314.

#!/bin/sh

hg init
mkfifo p

hg serve --stdio < p &
P=$!
(echo lock; echo addchangegroup; sleep 5) > p &
Q=$!
sleep 3
kill -HUP $P
wait
ls .hg