In his simulations, it was extremely rare for someone to have their mutual first picks; but many people had those that were second or third picks. In this scenario a couple counts as happy if each is near the top of the other's list and neither can find someone they and that other person would both prefer more.
Push 3KB chunks
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tempted to start the slice out at a larger size, to avoid all of these
No custom ReadableStream class with hidden internal state. A readable stream is just an AsyncIterable. You consume it with for await...of. No readers to acquire, no locks to manage.