|  | @@ -938,9 +938,9 @@ | 
                                                    
                                                        |  |  |  block discarded – undo | 
                                                                                                                                                                                                                    
                                                            | 938 | 938 |      /** | 
                                                                                                            
                                                            | 939 | 939 |       * Verify that a given parameter is boolean | 
                                                                                                            
                                                            | 940 | 940 |       * | 
                                                                                                            
                                                            | 941 |  | -     * @param mixed $parameter The given parameter to validate. | 
                                                                                                            
                                                            |  | 941 | +     * @param boolean $parameter The given parameter to validate. | 
                                                                                                            
                                                            | 942 | 942 |       * @param string $varName The name of the variable. | 
                                                                                                            
                                                            | 943 |  | -     * @return true If the parameter is a boolean. | 
                                                                                                            
                                                            |  | 943 | +     * @return boolean If the parameter is a boolean. | 
                                                                                                            
                                                            | 944 | 944 |       * @throws InvalidArgumentException If the parameter is not a boolean. | 
                                                                                                            
                                                            | 945 | 945 |       */ | 
                                                                                                            
                                                            | 946 | 946 |      protected function isBool($parameter, $varName) | 
                                                                                                                                                
                                         
                                        
                                            
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