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: alt.rs
    path of file: ./repos/y-crdt/yrs/src
    
    the code of the file until where you have to start completion: //! `alt` module contains a set of auxiliary functions that can be used for common operations
//! over document [Update]s directly on their binary representati
    
pub fn merge_updates_v2(updates: &[&[u8]]) -> Result<Vec<u8>, Error> {
    let mut merge = Vec::with_capacity(updates.len());
    for &buf in updates.iter() {
        let update = Update::decode_v2(buf)?;
        merge.push(update);
    }
    Ok(Update::merge_updates(merge).encode_v2())
}