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Rewrote my day 6 challenge in from building an object tree with Rc + RefCell to a much simpler version that only uses a string to string mapping for the tree traversal.
Also threw in FNV as HashMap hasher for an extra speed bump. The difference is huge.

Part 1 is 61% faster (598 μs down to 233 μs).
Part 2 is 97% faster (40 ms down to 1 ms).

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