I had a look into the documentation before, but I interpreted it more like a guideline than a restriction. It might help to mention the restriction to those specific mask characters in the documentation. Now that I know about it, i can adjust my code accordingly.
RARachel A Syncfusion Team September 16, 2019 01:51 AM
Thanks for your suggestion.
We have considered your suggestion in improving the documentation and it will updated in the documentation content shortly.