On Thu, May 10, 2012 at 12:41:13PM +0200, Bert Freudenberg wrote:
> 
> On 10.05.2012, at 01:40, Chris Muller wrote:
> 
> >> How do these clients suddenly
> >> acquire new hashes for nil, true and false?
> > 
> > I should add, it's already happened.  In 2009 Levente changed
> > Object>>#identityHash to answer the scaledIdentityHash.
> 
> Not in Squeak. Our IdentityDictionary uses scaledIdentityHash nowadays, but identityHash itself is left alone, answering the primitive value directly.
> 
> You may be thinking of Pharo, where you now need to use basicIdentityHash to get the primitive hash, and identityHash answers the more useful scaled value. Be aware though that Pharo also manipulates SmallInteger hashes where Squeak doesn't (yet, anyway).
> 
> Did I mention it's a bad idea to depend on actual hash values? ;)
> 
> - Bert -

Squeak:
  nil identityHash ==> 3840
  true identityHash ==> 2950
  false identityHash ==> 3152

Pharo:
  nil identityHash ==> 1006632960
  true identityHash ==> 773324800
  false identityHash ==> 826277888
  nil basicIdentityHash ==> 3840
  true basicIdentityHash ==> 2950
  false basicIdentityHash ==> 3152