Hi. So few things...
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Returning an array from a function node is intended for when you have multiple outputs on the function note.
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the return value from a function node must always be an object (or array of objects). If you intend on sending an array, assign it to the message payload property.
Try this....
msg.payload = [ "false" , "false", "false", "false", "false", "false" ,"false" ]
return msg;