Function safeAdd

app/public/socketcluster-client.js:8039–8043

(x, y)

function safeAdd(x, y) {
  const lsw = (x & 0xffff) + (y & 0xffff);
  const msw = (x >> 16) + (y >> 16) + (lsw >> 16);
  return msw << 16 | lsw & 0xffff;
}
/*
 * Bitwise rotate a 32-bit number to the left.
 */