Allow formatters to have parameters

[carasel]

It would be very useful if formatters could have parameters so that, for example, an alternative BooleanFormatter could be created which could have the expected true and false values passed in as parameters, rather than only working for true = 1.

Currently this isn't possible, as the Formatter on TextField is internal.

[mscribellito]

Have you looked into creating an additional custom formatter? Instead of using the boolean one included?