perf: use path.as_os_str().hash() instead of path.hash() (#316)

perf: try `path.as_os_str().hash()` instead of `path.hash()`

Author: Boshen

src/cache.rs

@@ -44,7 +44,7 @@ impl<Fs: FileSystem> Cache<Fs> {
     pub fn value(&self, path: &Path) -> CachedPath {
         let hash = {
             let mut hasher = FxHasher::default();
-            path.hash(&mut hasher);
+            path.as_os_str().hash(&mut hasher);
             hasher.finish()
         };
         if let Some(cache_entry) = self.paths.get((hash, path).borrow() as &dyn CacheKey) {