/// Configure how caches are used to speed up various git repository operationsimpl crate::Repository {    /// Sets the amount of space used at most for caching most recently accessed fully decoded objects, to `Some(bytes)`,    /// or `None` to deactivate it entirely.    ///    /// Note that it is unset by default but can be enabled once there is time for performance optimization.    /// Well-chosen cache sizes can improve performance particularly if objects are accessed multiple times in a row.    /// The cache is configured to grow gradually.    ///    /// Note that a cache on application level should be considered as well as the best object access is not doing one.    pub fn object_cache_size(&mut self, bytes: impl Into<Option<usize>>) {        let bytes = bytes.into();        match bytes {            Some(0) => self.objects.unset_object_cache(),            Some(bytes) => self                .objects                .set_object_cache(move || Box::new(crate::object::cache::MemoryCappedHashmap::new(bytes))),            None => self.objects.unset_object_cache(),        }    }     /// Set an object cache of size `bytes` if none is set.    ///    /// Use this method to avoid overwriting any existing value while assuring better performance in case no value is set.    pub fn object_cache_size_if_unset(&mut self, bytes: usize) {        if !self.objects.has_object_cache() {            self.object_cache_size(bytes);        }    }     /// Return the amount of bytes the object cache [should be set to](Self::object_cache_size_if_unset) to perform    /// diffs between trees who are similar to `index` in a typical source code repository.    ///    /// Currently, this allocates about 10MB for every 10k files in `index`, and a minimum of 4KB.    #[cfg(feature = "index")]    pub fn compute_object_cache_size_for_tree_diffs(&self, index: &gix_index::State) -> usize {        let num_tracked = index.entries().len();        let ten_mb_for_every_10k_files = (num_tracked as f32 / 10_000.0) * (10 * 1024 * 1024) as f32;        (ten_mb_for_every_10k_files as usize).max(4 * 1024)    }} /// Handling of InMemory object writingimpl crate::Repository {    /// When writing objects, keep them in memory instead of writing them to disk.    /// This makes any change to the object database non-persisting, while keeping the view    /// to the object database consistent for this instance.    pub fn with_object_memory(mut self) -> Self {        self.objects.enable_object_memory();        self    }}