有没有办法设置mongoose来检查单个模式中的两个值是否匹配？

const userSchema = new mongoose.Schema({
  username: {
    type: String,
    required: true,
    match: /^[a-zA-Z0-9]+$/,
  },
  password: {
    type: String,
    required: true,
  },
});

const userSchema = new mongoose.Schema({
  password: {
    type: String,
    required: true,
    validate: {
      validator: function(value) {
        // 自定义验证逻辑
        return value.length >= 6 && value.length <= 20;
      },
      message: '密码长度必须在6到20个字符之间',
    },
  },
});