Hi,

I redefined #= and #hash in one of my classes. Objects from this class 
are mutable and the hash value change when this objects change. It seems 
  wrong to store mutable objects like this in a set but I can't find any 
documentation about this anywhere. Because when you add such an object 
into one Set and change the object, then the set won't find your object 
using #includes: anymore.

What is allowed and what is not please ?


Thank you