Each consumer registers its own asyncio.Queue. When the value changes, the setter pushes (old, new) into every registered queue. Here's a simplified version that illustrates the core idea:
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Last year, two in five Americans did not read a single book, and reading for pleasure has plummeted about 40% over the past two decades. Yet many of the world’s most successful people credit reading as central to their curiosity, critical thinking, and leadership. A JPMorgan survey released last year of more than 100 billionaires found that reading ranked as the top habit elite achieves have in common.
It was a bad assumption on my end, and of course I was happy to deliver a better solution that works well for my client.