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Ian Hickson authored
This lets you use `Listenable.merge` without having to sanitize your incoming list of change notifiers, in case your semantics are that they are optional.
b2c244ef 
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| caching_iterable_test.dart | ||
| change_notifier_test.dart | ||
| covariant_templates_test.dart | ||
| licenses_test.dart | ||
| stack_trace_test.dart |