public boolean equals(@Nullable Object obj) {
      if (obj instanceof SameLongInstance) {
        SameLongInstance that = (SameLongInstance) obj;
        return i == that.i;
      }
      return false;
    }
  }

  static class SameFloatInstance {
    private final Float i;

    public SameFloatInstance(Float i) {
      this.i = checkNotNull(i);
    }