Column filter's "operator" argument never changes after setting

[pmiklashevych]

https://www.bryntum.com/forum/viewtopic.php?f=52&t=17428&p=86488#p86488

https://bryntum.com/docs/gantt/#Grid/column/Column#config-filterable

http://lh/bryntum-suite/grid/examples/filtering/

Set Age column definition:

        {
            text       : 'Age',
            field      : 'age',
            width      : 100,
            type       : 'number',
            filterType : 'number',
            filterable : {
                filterFn : ({ value, record, operator }) => {
                    console.log(operator, value);
                    return true;
                }
            }
        },

Open the demo and type "3" to "More than" in the Age column filter. Then type "4" to "Less then". Then type "5" to "Equals". See the console log prints out "> 3", "> 4", "> 5". Expected result is "> 3", "< 4", and "= 5".