{"type":"Feature","properties":{"what":"no id"},"geometry":{"type":"Point","coordinates":[1,1]}}
{"type":"Feature","id":12345,"properties":{"what":"will survive"},"geometry":{"type":"Point","coordinates":[1,1]}}
{"type":"Feature","id":12346,"properties":{"what":"will win over the duplicate even though it's in another tile"},"geometry":{"type":"Point","coordinates":[-1,-1]}}