original_string: public function timestampsTz($precision = 0)
      {
          $this->timestampTz('created_at', $precision)->nullable();
  
          $this->timestampTz('updated_at', $precision)->nullable();
      }
code: public function timestampsTz($precision = 0)
      {
          $this->timestampTz('created_at', $precision)->nullable();
  
          $this->timestampTz('updated_at', $precision)->nullable();
      }
code_tokens: public function timestampsTz ( $ precision = 0 ) { $ this -> timestampTz ( 'created_at' , $ precision ) -> nullable ( ) ; $ this -> timestampTz ( 'updated_at' , $ precision ) -> nullable ( ) ; }
docstring: Add creation and update timestampTz columns to the table.
  
  @param  int  $precision
  @return void
docstring_tokens: Add creation and update timestampTz columns to the table .