sclass RandomAndVary_Float implements RandomAndVary<Float> {
  float min = 0, max = 1;
  double varyFactor = 0.1;
  
  public Float randomInstance() { ret randomFloat(min, max); }
  public Float varyInstance(Float a) {
    ret (float) clipDouble(min, max, a+(max-min)*varyFactor);
  }
}