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When supplying an empty query string to the filter function an exception is thrown. In most programs empty queries result in all items being displayed. As a result the exception may be unexpected and requires additional code to handle.

The documentation states, that the DisplayFilter is initialized with a default set of functions (currently 'lower', 'upper', 'length'). It is stated further, that the default set of functions can be changed using the functions parameter. If required, functions can be unset by setting the functions parameter to {}. However, the DisplayFilter does not handle this case correctly. While custom functions can be defined and replace the default functions, it is not possible to initialize the DisplayFilter with no functions.

Currently the documentation does not state that there are various types of display filters e.g. for filtering lists, objects and sql databases.