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Checks if value is a power-of-2.
Similar: log2, pow2, isPow2, nextPow2, prevPow2.
isPow2(x) // x: an int32
const xinteger = require('extra-integer'); xinteger.isPow2(1024); // → true xinteger.isPow2(63); // → false xinteger.isPow2(1); // → true