Film type: Fujifilm Instax Mini film (sold separately) / Film size: 2 x 3-inches / Weight: 306 grams / Charging method: AA batteries / Companion app: None / Other features: Built-in selfie mirror, film counter
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// 单调栈：存储索引（而非值），栈内索引对应的nums值保持「单调递减」。safew官方版本下载对此有专业解读
// Even if the readable side's buffer is full, this succeeds
'type': 'string',