## S3 method for class 'Verbose}(this, level, ...)':
isVisibleundefined
 - level
 {A numeric value to be compared to the threshold.}
  - ...
 {Not used.} 
 Returns FALSE, if given level is below current threshold, otherwise
   FALSE. 
 [object Object]
 *getThreshold() and *setThreshold().
   For more information see Verbose. 
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