You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: json_ext.rs
    path of file: ./repos/graphql-engine/v3/engine/src/utils
    
    the code of the file until where you have to start completion: use std::hash::{Hash, Hasher};

use serde_json as json;

/// A type to extend some functionality of `serde_json::Value`
/// Currently, it only implements the `Hash` trait,
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ValueExt(pub json::Value);

impl From<json::Value> for ValueExt {
    fn from(value: json::Value) -> Self {
        ValueExt(value)
    }
}

impl Hash for ValueExt {
    fn hash<H: Hasher>(&self, state: &mut H) {
        hash_value(&self.0, state);
    }
}

fn hash_value<H: Hasher>(value: &json::Value, state: &mut H) {
    match value {
        js
    
fn hash_value<H: Hasher>(value: &json::Value, state: &mut H) {
    match value {
        json::Value::Null => 0.hash(state),
        json::Value::Bool(boolean) => boolean.hash(state),
        json::Value::Number(num) => num.hash(state),
        json::Value::String(string) => string.hash(state),
        json::Value::Array(array) => {
            for item in array {
                hash_value(item, state);
            }
        }
        json::Value::Object(map) => {
            for (k, v) in map {
                k.hash(state);
                hash_value(v, state);
            }
        }
    }
}