grid.filterData() not working for dates

[Isomorphic]

You haven't declared a DataSourceField for the date field where you are applying the filter. This means that filtering for that field falls back to typeless filtering, which won't properly handle date comparisons in all cases.

[slick07]

Using:
SmartClient Version: v10.0p_2019-03-11/LGPL
Firefox 67.0.4 (64-bit)
Attached is a test case. If you press the Filter button it should filter the grid by dates but instead it does nothing. What is wrong with it? TestCase.java