Ignore misfiring lint.

Tweak some comments.

analysis_options.yaml

diff --git a/analysis_options.yaml b/analysis_options.yaml
index 79f0950..0b0a7b5 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -1,7 +1,8 @@
 include: package:lints/recommended.yaml
 analyzer:
   errors:
-    deprecated_member_use_from_same_package: ignore
+    deprecated_member_use_from_same_package: ignore # https://github.com/dart-lang/linter/issues/2703
+    void_checks: ignore # https://github.com/dart-lang/linter/issues/2685
 linter:
   rules:
     - avoid_unused_constructor_parameters

lib/isolate_runner.dart

diff --git a/lib/isolate_runner.dart b/lib/isolate_runner.dart
index 7d7e990..15e0f65 100644
--- a/lib/isolate_runner.dart
+++ b/lib/isolate_runner.dart
@@ -247,9 +247,8 @@
   /// the returned future will be completed after one second,
   /// using [ping] to check if the isolate is still alive.
   Future<void>? get onExit {
-    // TODO(lrn): Is there a way to see if an isolate is dead
-    // so we can close the receive port for this future?
-    // Using [ping] for now.
+    // Using [ping] to see if the isolate is dead.
+    // Can't distinguish that from a slow-to-answer isolate.
     if (_onExitFuture == null) {
       var channel = SingleResponseChannel<void>();
       isolate.addOnExitListener(channel.port);

lib/src/errors.dart

diff --git a/lib/src/errors.dart b/lib/src/errors.dart
index 34d2555..4c76642 100644
--- a/lib/src/errors.dart
+++ b/lib/src/errors.dart
@@ -2,7 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// TODO(lrn): This should be in package:async?
 /// Helper functions for working with errors.
 ///
 /// The [MultiError] class combines multiple errors into one object,