This hasn’t entirely changed. We still enjoy stories about malevolent machines, like the homicidal A.I. doll in “M3gan.” With other fictional robots, it’s not clear if they’re dangerous or merely hapless: Look to “Sunny,” recently on Apple TV+, in which a human protagonist spends most of the series trying to determine if she can trust the upbeat, bumbling homebot left to her by her roboticist husband. That kind of fear and suspicion, though, has mainly been reserved for adults. Children are offered a far more optimistic view — one that has lately seemed to go well beyond the endearing robots of the past, like R2-D2 and BB-8 in the “Star Wars” films, or the Iron Giant, or Sox in “Lightyear.”