title: quasar q-checkbox does not get checked on data edit
body: <p>All,</p>
  
  <p>I have edit record scenario in which checkboxes not automatically gets selected based on the model data. As shown in the image, I have debug display for the checkbox model. Does quasar support checked data automatically from model or do I need to anything special in my code? I tried few thing but nothing looks clean. Any help is much appreciated.</p>
  
  <p><a href="https://i.stack.imgur.com/qMaqj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qMaqj.png" alt="enter image description here"></a></p>
  
  <p>Below is my checkbox code segment in a child component. The child component is used in many parent pages. I have used v-model in other cases just like in the <a href="https://quasar.dev/vue-components/checkbox#Example--Array-as-model" rel="nofollow noreferrer">quasar example</a> and checkboxes work fine on the parent page. In my case, I am trying to use group checkboxes in child component and sync the values to the parent page. It looks like an alternate solution for me is to duplicate checkboxes in all parent pages. Even with the child component approach, the primary scenario works good - meaning data creating/insert where I can check/uncheck checkbox value and record save works fine. My issue is in the secondary scenario - where I am trying to edit the record by pulling saved data, in this scenario all data elements get prefilled ok except group checkboxes.    </p>
  
  <blockquote>
  <pre><code>    &lt;div&gt;
        &lt;q-field
          :value="durations"
          label="Select duration option"
          stack-label
          ref="durations"
          :rules="[durationRule]"
        &gt;
          &lt;template v-slot:control&gt;
            &lt;q-checkbox
              :value="durations"
              val="30"
              label="30 min"
              @input="$emit('update:durations', $event)"
            /&gt;
            &lt;q-checkbox
              :value="durations"
              val="60"
              label="60 min"
              @input="$emit('update:durations', $event)"
            /&gt;
            &lt;q-checkbox
              :value="durations"
              val="120"
              label="120 min"
              @input="$emit('update:durations', $event)"
            /&gt;
          &lt;/template&gt;
        &lt;/q-field&gt;
      &lt;/div&gt;
  </code></pre>
  </blockquote>