It's not a silly question, but you're missing a fundamental point - in order to determine if something is '!this' then you need something to compare with 'this'. For example, if you have an array of numbers and you what to change any number that is !7, then you need to read through the array and compare 7 with the value in each element.
Therefore, you will need a 'set' in which compare one the the elements (this). As clones are objects and as an array can hold objects, assigning each new clone to an array element will allow you to create such a set which can then be iterated for such a purpose.
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