[Pharo-users] how to test, if the class has "shared identity" of instances in the whole image (SmallIntegers, Symbols...)

[Petr Fischer via Pharo-users]

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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

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