Hello, some classes, like Symbols or SmallIntegers, shares identity of value instances in the whole image (I may say it wrong), so: 1 == 1 copy. [true] #aaa == #aaa copy. [true] all other classes not, like Strings, Objects etc., so: 'aaa' == 'aaa' copy. [false] Is there any test method (maybe on the class side) I could ask for this (isXXX)? Thanks! pf