wip: before scheduler simplify

packages/core/src/scheduler.rs

@@ -657,9 +657,17 @@ impl TaskHandle {
     }
 }
 
+/// A component's unique identifier.
+///
+/// `ScopeId` is a `usize` that is unique across the entire VirtualDOM - but not unique across time. If a component is
+/// unmounted, then the `ScopeId` will be reused for a new component.
 #[derive(serde::Serialize, serde::Deserialize, Copy, Clone, PartialEq, Eq, Hash, Debug)]
 pub struct ScopeId(pub usize);
 
+/// An Element's unique identifier.
+///
+/// `ElementId` is a `usize` that is unique across the entire VirtualDOM - but not unique across time. If a component is
+/// unmounted, then the `ElementId` will be reused for a new component.
 #[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
 pub struct ElementId(pub usize);
 impl Display for ElementId {