| Index: pkg/serialization/lib/src/serialization_rule.dart
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| diff --git a/pkg/serialization/lib/src/serialization_rule.dart b/pkg/serialization/lib/src/serialization_rule.dart
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| index 4ffe9663cea8eefeebf1e54546301035d1df844b..b31df10ea158779769d71eac3b70de1af31913d1 100644
 | 
| --- a/pkg/serialization/lib/src/serialization_rule.dart
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| +++ b/pkg/serialization/lib/src/serialization_rule.dart
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| @@ -529,6 +529,7 @@ class _LazyMap implements Map {
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|  
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|    int get length => _raw.length;
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|    bool get isEmpty => _raw.isEmpty;
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| +  bool get isNotEmpty => _raw.isNotEmpty;
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|    Iterable get keys => _raw.keys;
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|    bool containsKey(x) => _raw.containsKey(x);
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|  
 | 
| 
 |