fix: don't reset the shared counter value on init.

Byron · Byron · commit 414bc71e7947 · 2022-09-20T13:32:00.000+08:00
It's possible to re-initialize the progress, and when that's done
it would detach the counter from previous instances that might have
been observed by callers to `counter()`, which is surprising.
diff --git a/src/tree/item.rs b/src/tree/item.rs
@@ -57,7 +57,7 @@ impl Item {
     /// **Note** that this method can be called multiple times, changing the bounded-ness and unit at will.
     pub fn init(&mut self, max: Option<usize>, unit: Option<Unit>) {
         if let Some(mut r) = self.tree.get_mut(&self.key) {
-            self.value = Default::default();
+            self.value.store(0, Ordering::SeqCst);
             r.value_mut().progress = (max.is_some() || unit.is_some()).then(|| Value {
                 done_at: max,
                 unit,
