Merge #1410

1410: feat(runtime-core) Implement `ImportObjectIterator::size_hint`. r=MarkMcCaskey a=Hywan

Because it is helpful in some circumstances.

Co-authored-by: Ivan Enderlin <ivan@mnt.io>

lib/runtime-core/src/import.rs

@@ -192,9 +192,16 @@ pub struct ImportObjectIterator {
 
 impl Iterator for ImportObjectIterator {
     type Item = (String, String, Export);
+
     fn next(&mut self) -> Option<Self::Item> {
         self.elements.pop_front()
     }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        let len = self.elements.len();
+
+        (len, Some(len))
+    }
 }
 
 impl IntoIterator for ImportObject {