The upshot of this is if I had created an IdentityDictionary before the #becomeForward, such as

(C := IdentityDictionary new)
    at: A put: 1;
    at: B put: 2.

Then after the #becomeForward: I find (C at: A) = 1 (C at: B) = 1

I would have imagined that after the #becomeForward: that A would now take the original #identityHash value of B. So

(C at: A) = 2
(C at: B) = 2

Well - first of all, after the #becomeForward: operation you'll have two identical keys in the Dictionary (meaning that your Dictionary is screwed up anyways). Whose's value you'll get depends on what is found first in the Dictionary; and if there has been any collision between A and B before you did your #becomeForward: operation you'll get the value of the first (which is '1' in your above example) since that association is in the right place for the key. If there hasn't been a collision you should get the value of the second one - so just have your code run often enough and you'll get different results.

BTW, how do proxies deal with this issue?! Do they generally keep an ID hash for the external object around?!

Andreas -- +===== Andreas Raab ========= (andreasr@wdi.disney.com) ==+ | Walt Disney Imagineering Phone: +1 818 544 5016 I I Glendale, CA Fax: +1 818 544 4544 I +======< http://isgwww.cs.uni-magdeburg.de/~raab >========+