Impl Id convert methods

src/data.rs

@@ -68,3 +68,15 @@ macro_rules! id_impl {
 
 id_impl!(u32, Id, INVALID_ID);
 id_impl!(u16, SmallId, INVALID_SMALL_ID);
+
+impl From<SmallId> for Id {
+    fn from(value: SmallId) -> Self {
+        Self(value.0 as u32)
+    }
+}
+
+impl From<Id> for SmallId {
+    fn from(value: Id) -> Self {
+        Self(value.0 as u16)
+    }
+}