Can't change variable bound to v-model

[Mat-thieu]

There's no way to change the variable when it's used in the v-model of this component

<highlightable-input
      :highlight-style="`color:#0099FF`"
      style="padding: 10px 15px;"
      :highlight-enabled="true"
      :highlight="highlight"
      v-model="input"
      ref="input">
</highlightable-input>

// does nothing
this.input = 'something';