Why Decoding Uniswap V4 is Harder Than V2 & V3

This story was originally published on HackerNoon at: https://hackernoon.com/why-decoding-uniswap-v4-is-harder-than-v2-and-v3.
This post explains why decoding Uniswap V4 is fundamentally harder than V2 and V3, and what changes at the data layer.
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Uniswap V4 is fundamentally harder to decode than V2 and V3. The biggest change is that pools are no longer contracts. Hooks are external contracts that emit their own events.