function copy$7(out, a) {
    out[0] = a[0];
    out[1] = a[1];
    out[2] = a[2];
    out[3] = a[3];
    out[4] = a[4];
    out[5] = a[5];
    out[6] = a[6];
    out[7] = a[7];
    return out;
  }
Copy the values from one dual quat to another

@param {quat2} out the receiving dual quaternion
@param {quat2} a the source dual quaternion
@returns {quat2} out
@function