@arithmetic-type/uint64

:rabbit: @arithmetic-type/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.
For the 32-bit counterpart, see arithmetic-type/uint32.

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

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