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{% func Boolean(x any, nullable bool, k string) %}{% stripspace %}
  {% code b, isBool := x.(bool) %}
  {% if isBool && b %}
    <label class="radio-label"><input value="true" name="{%s k %}" type="radio" checked="checked" /> true</label>
  {% else %}
    <label class="radio-label"><input value="true" name="{%s k %}" type="radio" /> true</label>
  {% endif %}

  {% if isBool && !b %}
    <label class="radio-label"><input value="false" name="{%s k %}" type="radio" checked="checked" /> false</label>
  {% else %}
    <label class="radio-label"><input value="false" name="{%s k %}" type="radio" /> false</label>
  {% endif %}

  {% if nullable %}
    {% if x == nil %}
      <label class="radio-label"><input value="∅" name="{%s k %}" type="radio" checked="checked" /> nil</label>
    {% else %}
      <label class="radio-label"><input value="∅" name="{%s k %}" type="radio" /> nil</label>
    {% endif %}
  {% endif %}
{% endstripspace %}{% endfunc %}