arithmetic-type/uint64

:rabbit: [@arithmetic-type/uint64](https://arithmetic-type.github.io/uint64)
==

64-bit unsigned integer arithmetic and logic operators for JavaScript.
Implemented using big endian arrays of two signed 32-bit integers.

Used in [js-hash](https://github.com/make-github-pseudonymous-again/js-hash).
For the 32-bit counterpart, see [arithmetic-type/uint32](https://github.com/arithmetic-type/uint32).

```js
let a = get64(0, 1) ;
rotr64(a, 1); // [-1, 0]

let x = get64(0xFFFFFFFF, 0xFFFFFFFF);
add64(x, x); // [-1, -2]
```

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