[postgis-users] am I misunderstanding distance() or a bug?

[strk at refractions.net]

I've found the bug.
I wonder how is it possible that no one noticed this before!

A side effect of the bug is that distance(a,b) can be different
from distance(b,a).
This applies to your testcase (urgh).

http://postgis.refractions.net/bugs/bug.php?op=show&bugid=108

If you can give a try to current head you should find it fixed.

Thanks for your report.

--strk;