Bumping an array filtering value converter in Aurelia

test-value-converter.js

export class TestValueConverter {
    toView(value, selected, rebind) {
        console.log("Running value converter");

        return value.filter(val => {

            var found = false;

            selected.forEach(sel => {
                if (val.toLowerCase().indexOf(sel) > -1)
                    found = true;
            });

            return found;
        });
    }
}

view-model.js

export class ViewModel {
  testPeople = ["Charles", "Fred", "John", "James", "Steve", "Andy", "Martin", "Dan", "Paul", "Anne", "Joseph", "Chris", "Jams", "Francis"];
  testFinders = ["ch", "fr", "jo", "ja", "st", "an"];
  selectedFinders = [];
  testFlag = false;
    
  constructor(observerLocator:ObserverLocator)
  {
    observerLocator.getArrayObserver(this.selectedFinders).subscribe(() => {
      this.testFlag = !this.testFlag; 
    });
  }
}

view.html

<template>
  <require from=".test-value-converter"></require>
  <label repeat.for="item of testFinders">
    <input type="checkbox" checked.bind="$parent.selectedFinders" value.bind="item" />${item}
  </label>

  ${selectedFinders}

  <div repeat.for="person of testPeople | test:selectedFinders:testFlag">
    <p>${person}</p>
  </div>
</template>