Unexpected behaviour from the 'in' operator

[Greg Ewing (using news.cis.dfn.de)]

Rene Pijlman wrote:
> If this is true I guess the equality operator could be optimized
> to first check for identity, and only test non-identical objects
> for equality.

That would be a semantic change. Currently it's possible
to create an object that is not == to itself; if the
above optimisation were made, this wouldn't work
reliably.

-- 
Greg Ewing, Computer Science Dept,
University of Canterbury,	
Christchurch, New Zealand
http://www.cosc.canterbury.ac.nz/~greg