This is just a guess. It could be for compatibility reasons. Objects (literals) contain data in the form of key-value pairs. The entries() should return both, key and value. Sets contain only values. Adding duplicates can be a way to make the result of entries() and its format consistent.
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I'm puzzled why
entries()return an array for each element, containing the same thing twice. What's the use of that?This is just a guess. It could be for compatibility reasons. Objects (literals) contain data in the form of key-value pairs. The
entries()should return both, key and value. Sets contain only values. Adding duplicates can be a way to make the result ofentries()and its format consistent.