Computer systems are in many waysopen systems, providing the keys tothe vault if one is so inclined to grabthem. But in order to foster an air ofimmutability in our own systems,its of utmost importance to create afaçade of immutability. Immutability -- The Joy of Clojurerequires that we layer over andabstract the parts of our system thatprovide unrestrained mutability.
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Example: Inquirea simple service forexposing systemmetrics