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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.
I kept wanting one thing: paste a public URL, and get a unified diff when the text changes — in email, Slack, or a JSON webhook I can point at n8n. Screenshot tools are built for that inbox moment ("something changed, go look"). Self-hosting changedetection.