This is not the right conclusion. “Completed” isn’t a file implicit field, it’s a field you create (as “Something:”, or “Magic:”). Dataview doesn’t deduce that by “Completed” you create a “Yes or No” field. Because that, “Batman”, “Ice”, etc. are accepted!
If you want to check all the valid implicit fields, create this query (to limit the results to one or two pages, create an specific tag in that pages:
```dataview
LIST file
FROM #test
```