pub fn use_rawnumber(mut self) -> Self {
        self.parser.cfg.use_rawnumber = true;
        self
    }
Parse all number as [`crate::RawNumber`].

# Example
```
use sonic_rs::{Deserializer, Value};
let json = r#"{"a":1.2345678901234567890123}"#;
let mut de = Deserializer::from_str(json).use_rawnumber();
let value: Value = de.deserialize().unwrap();
let out = sonic_rs::to_string(&value).unwrap();
assert_eq!(json, out);
```
src/serde/de.rs