vue单选框返回字符串而不是布尔值

<template>
  <div>
    <input type="radio" id="option1" value="option1" v-model="selectedOption">
    <label for="option1">Option 1</label>
    <br>
    <input type="radio" id="option2" value="option2" v-model="selectedOption">
    <label for="option2">Option 2</label>
    <br>
    <input type="radio" id="option3" value="option3" v-model="selectedOption">
    <label for="option3">Option 3</label>
  </div>
</template>

<script>
export default {
  data() {
    return {
      selectedOption: '' // 用于接收选中的值
    };
  }
};
</script>