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Source: [Hacker News](https://www.crm.cat/a-single-ball-on-a-fixed-table-can-compute-eva-miranda-and-isaac-ramos-prove-that-two-dimensional-billiards-are-turing-complete/)
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Extract one mutator only after tests pin object identity. Value equality alone hides alias bugs in shared containers. A copied list can match every item and still break a later caller.
No Python. No Node. Just Bash and jq.