Restriction of default-property's type of variables to boolean is not true

Linter says: Error: type error: property "default" should be of type bool. (in TeamLayer/teamplay, TeamLayer/teamplay, TeamLayer/teamplay)

Thats not true, default can hold anything, even json-strings. Even workadventures documentation has a empty json-object as example https://workadventu.re/map-building/variables.md. Over that using jsons in default is tested by me with play.workadventure, works perfectly even when persisting the variable.