res[realIdx] = stack.length ? stack.at(-1) : -1;
The Web streams spec requires promise creation at numerous points — often in hot paths and often invisible to users. Each read() call doesn't just return a promise; internally, the implementation creates additional promises for queue management, pull() coordination, and backpressure signaling.
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The Mini 12 also offers a number of other niceties. I appreciated the larger-than-average viewfinder and the small counter that shows your remaining shots, which is a useful tracking feature given that each print costs about $1. However, it doesn’t support Bluetooth or pair with a companion app that allows you to edit photos (only scan them), and it doesn’t feature filters, lens options, or portrait modes. But if you’re looking for a solid instant camera that caters to all ages and experience levels, you’ll likely be satisfied with the Instax Mini 12.