"==" not symmetric

[Lionello Lunesu]

I was checking some sources in the 'internal' folder and saw this:

#int _d_obj_eq(Object o1, Object o2)
#{
#    return o1 is o2 || (o1 && o1.opEquals(o2));
#}

truth table:
o1 o2   result
 0   0     1
 0   x     0
 x   0     opEquals, crash?
 x   x     1
 y   x     opEquals

It's interesting that (o1==o2) is not necessarily the same as (o2==o1)!
Since o1=x,o2=0 returns 0, the other way around should return 0 as well.

I suppose the function should be also check o2, resulting in:

#int _d_obj_eq(Object o1, Object o2)
#{
#    return o1 is o2 || (o1 && o2 && o1.opEquals(o2));
#}

L.