[QUESTION] 如何严格控制字符串类型的字段，必须有双引号

{
"username": "testuser",
"password": "123456",
"email": "test@example.com",
"age": 25,
"transactionAmount": 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
}

transactionAmount 在java 类中定义的是string ，如何验证控制 传递的时候 transactionAmount 必须是字符串 双引号括起来的，这样可以 直接 readString（），不用 转成 bigdecimal 再转成 string 以防 bigdecimal 导致cpu 高

Start with the Java field declaration for transactionAmount and the deserialization path that reads it. Determine how the parser distinguishes a quoted string from an unquoted numeric value and define the expected validation behavior, including whether readString() must reject the unquoted input; done means the behavior is specified and covered by a regression test.

Written by the indexing model from the issue text.