object TryFilter <T>(IReadOnlyCollection <T> source, string filter)
{
var converter = FilterConverter <T> .TryCreate(filter);
if (converter == null)
{
return(source);
}
return(source
.Select(s => TryFilter(s, converter)));
}
object?TryFilter <T>(T source, FilterConverter <T> converter) => converter.Filter(source);