refactor: just use default

Author: KSXGitHub

src/app.rs

@@ -206,7 +206,6 @@ impl App {
         where
             SizeGetter: GetSizeUtils,
             SizeGetter::Size: Send + Sync + 'static,
-            u64: Into<SizeGetter::Size>, // TODO: remove this line after implementing `Size::ZERO`
         {
             type Hook = hook::RecordHardLink<'static, Self::Size>;
             fn create_hook(record: &'static hook::RecordHardLinkStorage<Self::Size>) -> Self::Hook {

src/app/sub.rs

@@ -191,7 +191,6 @@ impl<'a, Size> DeduplicateHardlinkSizes<Size> for hook::RecordHardLink<'a, Size>
 where
     DataTree<OsStringDisplay, Size>: Send,
     Size: size::Size + Sync,
-    u64: Into<Size>, // TODO: replace `0.into()` with `Size::ZERO`
 {
     type HardlinkRecord = &'a hook::RecordHardLinkStorage<Size>;
     type DeduplicationReport = &'a hook::RecordHardLinkStorage<Size>;
@@ -226,7 +225,7 @@ where
                 Some((*size, links))
             })
             .fold(
-                (0, 0, 0.into()),
+                (0, 0, Size::default()),
                 |(inodes, total_links, total_size), (size, links)| {
                     (inodes + 1, total_links + links, total_size + size)
                 },