wrong condition processing for entities

dataset is SG
query is
```
{
        from: 'entities',
        select: {
          key: ['geo'],
          value: ['name', 'world_4region', 'latitude', 'longitude']
        },
        where: {'is--country': true}
      }
```
current result an empty array
expected result: counties should be selected

ps: when I'm trying `where: {}` - it selects all of the entities 
