Enforce Rust and Swift ownership boundary

crates/app/src/domain.rs

@@ -80,6 +80,12 @@ pub struct IssueFilter {
     pub labels: BTreeSet<String>,
 }
 
+impl IssueFilter {
+    pub fn is_active(&self, status: &str) -> bool {
+        status != "open" || self != &Self::default()
+    }
+}
+
 #[derive(Clone)]
 pub struct RepositoryData {
     pub owner: String,
@@ -132,3 +138,21 @@ pub struct PullDetails {
 pub fn open_status() -> String {
     "open".into()
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn issue_filter_default_state_is_owned_by_rust() {
+        assert!(!IssueFilter::default().is_active("open"));
+        assert!(IssueFilter::default().is_active("closed"));
+        assert!(
+            IssueFilter {
+                milestone: "v1".into(),
+                ..Default::default()
+            }
+            .is_active("open")
+        );
+    }
+}