PHPOffice/PHPExcel — pull request #57 by argonym (2012-10-13 14:41:19+00:00)
Title: made dataTypeForValue (practically) overwritable

PHPExcel_Cell_DefaultValueBinder::bindValue() called dataTypeForValue() in self:: scope.
This made it impossible to overwrite dataTypeForValue() without overwrting bindValue().
Now calling dataTypeForValue() via $this.