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integers.\n\nUsed in [js-hash](https://github.com/make-github-pseudonymous-again/js-hash).\nFor the 32-bit counterpart, see [arithmetic-type/uint32](https://github.com/arithmetic-type/uint32).\n\n```js\nlet a = get64(0, 1) ;\nrotr64(a, 1); // [-1, 0]\n\nlet x = get64(0xFFFFFFFF, 0xFFFFFFFF);\nadd64(x, x); // [-1, -2]\n```\n\n[![License](https://img.shields.io/github/license/arithmetic-type/uint64.svg)](https://raw.githubusercontent.com/arithmetic-type/uint64/main/LICENSE)\n[![Version](https://img.shields.io/npm/v/@arithmetic-type/uint64.svg)](https://www.npmjs.org/package/@arithmetic-type/uint64)\n[![Tests](https://img.shields.io/github/actions/workflow/status/arithmetic-type/uint64/ci.yml?branch=main\u0026event=push\u0026label=tests)](https://github.com/arithmetic-type/uint64/actions/workflows/ci.yml?query=branch:main)\n[![Dependencies](https://img.shields.io/librariesio/github/arithmetic-type/uint64.svg)](https://github.com/arithmetic-type/uint64/network/dependencies)\n[![GitHub 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