in src/selectionBehavior.ts [85:89]
private static mapDataPointsToFilterValues (dataPoints: SampleSlicerDataPoint[]): any[] {
return (dataPoints
.map( (dataPoint: SampleSlicerDataPoint) => (dataPoint.category || null) ) || [])
.filter( (value: string | number | null ) => (typeof value === 'string' || typeof value === 'number') )
}