Looking at the failing tests I see that the objects really are supposed to be different (comparison with #~~). What fails is the equality check (#=) and for Date that is the method Timespan>>=. The problem that occurs there is a really old (and annoying one), namely that the timezone offset is handled inconsistently: the materialized object has the correct offset while the original object doesn't. 

So:
- FLBasicSerializationTest>>testDate fails because of timezone offset 
- FLBasicSerializationTest>>testGradientFillStyle fails because Object>>= isn't overridden in any subclass and therefore identity is checked, which fails
- (same as above for FLBasicInMemorySerializationTest)

The other failures seem to be due to implementation differences between Pharo and Squeak (I didn't really look into them) but I couldn't find one test that seemed to fail because of hashing problems. 
I'll see if I can come up with a test case.

Cheers,
Max


On 07.10.2012, at 16:38, Max Leske <maxleske@gmail.com> wrote:

The two objects I looked at where a string and an OrderedCollection. I wouldn't conclude that the problem is class specific...

On 07.10.2012, at 16:12, "Edgar J. De Cleene" <edgardec2005@gmail.com> wrote:

Re: [Pharo-project] Fuel for Squeak stupid questions


On 10/7/12 10:51 AM, "Max Leske" <maxleske@gmail.com> wrote:


Following you example, in Squeak FLBasicSerializationTest>>#testDate

materialized largeIdentityHash = 2571

 anObject. largeIdentityHash = 1094


So why Date serializaded object gives this and the rest of objects no ?

Edgar