code: func NewUniformSample(reservoirSize int) Sample {
  	if !Enabled {
  		return NilSample{}
  	}
  	return &UniformSample{
  		reservoirSize: reservoirSize,
  		values:        make([]int64, 0, reservoirSize),
  	}
  }
docs: // NewUniformSample constructs a new uniform sample with the given reservoir
  // size.