use git_object::{owned, HashKind};use std::io; pub trait Write {    type Error: std::error::Error + From<io::Error>;     fn write(&self, object: &owned::Object, hash: HashKind) -> Result<owned::Id, Self::Error> {        let mut buf = Vec::with_capacity(2048);        object.write_to(&mut buf)?;        self.write_stream(object.kind(), buf.len() as u64, buf.as_slice(), hash)    }    fn write_buf(&self, object: git_object::Kind, from: &[u8], hash: HashKind) -> Result<owned::Id, Self::Error> {        self.write_stream(object, from.len() as u64, from, hash)    }    fn write_stream(        &self,        kind: git_object::Kind,        size: u64,        from: impl io::Read,        hash: HashKind,    ) -> Result<owned::Id, Self::Error>;}