id: permit repeated flags

src/uu/id/src/id.rs

@@ -324,6 +324,7 @@ pub fn uu_app() -> Command {
         .about(ABOUT)
         .override_usage(format_usage(USAGE))
         .infer_long_args(true)
+        .args_override_self(true)
         .arg(
             Arg::new(options::OPT_AUDIT)
                 .short('A')

tests/by-util/test_id.rs

@@ -327,6 +327,11 @@ fn test_id_default_format() {
             .args(&args)
             .succeeds()
             .stdout_only(unwrap_or_return!(expected_result(&ts, &args)).stdout_str());
+        let args = [opt2, opt2];
+        ts.ucmd()
+            .args(&args)
+            .succeeds()
+            .stdout_only(unwrap_or_return!(expected_result(&ts, &args)).stdout_str());
     }
 }