How to use Groovy Set for unique elements? -

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as simple must still can't understand wrong:

class {     boolean equals(o) { true } } def s = [new a(), new a()] set assert s.size() == 1 // assertion failed: gives 2

which method should override in order uniqueness?

hashcode, java

class {     boolean equals(o) { true }     int hashcode() { 1 } } def s = [new a(), new a()] set assert s.size() == 1

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