is.min, this.max)
    : super(name, description) {
  ArgumentError.checkNotNull(min, &#39;min&#39;);
  ArgumentError.checkNotNull(max, &#39;max&#39;);
  if (!(min &lt; max)) throw new ArgumentError(&#39;min must be less than max&#39;);
  _value = min;
}</code></pre>
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