code: func (v Vec) Approx(v2 Vec) bool {
  	if !f64.Approx(v.X, v2.X) {
  		return false
  	}
  	if !f64.Approx(v.Y, v2.Y) {
  		return false
  	}
  	return true
  }
docs: // Approx reports wether v2 is approximately equal to v.
  //
  // Element-wise approximation uses f64.Approx()