"if [ s1 > s2 ]" broken, writing a s2 file

["solsTiCe d'Hiver" <solstice.dhiver@xxxxxxxxx>]

hello,
folowing that bug
https://bugs.launchpad.net/ubuntu/+source/update-notifier/+bug/1400357,
I follow through to investigate and I found out
that whatever I try, when comparing 2 strings I always end up with a
file written to disk

>From the man page
test expression
     [ expression ]
[...]
s1 > s2       True if string s1 comes after s2 based on the ASCII
value of their characters.

when I try to use it:
a="ert"
b="aze"
if [ $a > $b ] ; then
echo yes
fi
if [ "aer" > "azer" ] ;then
echo yes
fi

I got 2 yes printed on screen whereas only one should and most
importantly I got 2 empty files written to disk: one called "aze", and
another one "azer"

so this "if syntax" is broken or I don't knwo how to use it.

Also it is really dangerous  to use a syntax similar to file
redirection and this is exactly what is happening here.

this is happening with 0.5.8 too
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