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…in reply to @DanShappir
DanShappir I don't know without checking, but I'm guessing: 1) Yes: {} or maybe some Array guts, like length: 0? 2) No.
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…in reply to @rockerest
DanShappir If the array had entries, I'd guess { 0: [ zeroth value ] } etc., So probably wouldn't put Array stuff in there in any case.