Spread and what notes in Set ES5?

what’s the meaning of ‘notes’ in the challenge title?
maybe a bit more:
how is it integrated in ES5? something to do with putting it in an array?

function checkSet(set){
return [...set]
var set = new Set([1,2,3])
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Challenge: Use Spread and Notes for ES5 Set() Integration

Link to the challenge:

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