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: config.rs
    path of file: ./repos/fuel-core/crates/services/txpool/src
    
    the code of the file until where you have to start completion: use crate::types::ContractId;
use fuel_core_chain_config::ChainConfig;
use fuel_core_types::{
    fuel_tx::{
        Address,
        UtxoId,
    },
    fuel_types::Nonce,
};
use std::{
    collections:
    
    fn default() -> Self {
        let max_tx = 4064;
        let max_depth = 10;
        let min_gas_price = 0;
        let utxo_validation = true;
        let metrics = false;
        // 5 minute TTL
        let transaction_ttl = Duration::from_secs(60 * 5);
        let number_of_active_subscription = max_tx;
        Self::new(
            max_tx,
            max_depth,
            ChainConfig::default(),
            min_gas_price,
            utxo_validation,
            metrics,
            transaction_ttl,
            number_of_active_subscription,
            Default::default(),
        )
    }