Add an #identityHash check to prevent the recursive image lockup that…

[pdebruic]

…s possible with current #hash implementation

[pdebruic]

For issue #7724

[Ducasse]

Thanks for the contribution. We will have a look at it.

[dionisiydk]

It will not fix deep recursion:

a := #('A') asSet.
b := #('B') asSet.
b add: a.
a add: b.
a hash

[noha]

Nothing will fix this case where Sets include Sets

[guillep]

Nothing will fix this case where Sets include Sets

Not fixing, but I'd like to avoid the freezing:

https://guillep.github.io/blog/2026-08-07-overflow/

StackOverflowException Plz.

A small tour of Pharo's stack, stack pages, recursion, and the surprisingly elegant way to make stack overflow less of a VM panic button.