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You have 200 images to resize. The resize API is fast, but it throttles at 10 concurrent requests. If you throw Promise.all(images.map(resize)) at it, you'll blast all 200 simultaneously, collect a pile of 429s, and watch your retry logic.

Floating promises — async calls nobody awaits — don't crash immediately. They fail silently, corrupt state, and get cut off by serverless runtimes. Here's what to look for in code review.