A long time ago - could be 8 years back - we've made changes in the masks by using the Windows mask characters, formatting. In v6.2 we've added several formatting functions (see FormatNumber, FormatCurrency etc) for using masks as well.

Debatable is whether phone numbers should be formattable via a mask or that a formatting function is desired. I think a function is better and more logical than trying to catch it with a mask.