anchor.diff:      final dynamic capability = capabilitiesYaml[i];
       _checkType(capability is String, capability, 'required_agent_capabilities[$i]', 'string');
     }
  -  return capabilitiesYaml;
  +  return capabilitiesYaml.cast<String>();
   }
   
   void _checkType(bool isValid, dynamic value, String variableName, String typeName) {
  
positive.code:   final String stage;
  
    /// Capabilities required of the build agent to be able to perform this task.
    final List<String> requiredAgentCapabilities;
  
    /// Whether this test is flaky.
    ///
  
negative.code:   }
  }
  
  void _checkKeys(Map<dynamic, dynamic> map, String variableName, List<String> allowedKeys) {
    for (String key in map.keys) {
      if (!allowedKeys.contains(key)) {
        throw new ManifestError(
  