It is really cool to have https://github.com/JuulLabs/indexeddb - but sometimes it is a bit too restrictive: https://github.com/JuulLabs/indexeddb/issues/90 Maybe it could make sense to expose the internal used IDB js-externals so one can workaround such issues?

The restrictions are mostly there to remove many foot guns. In the case of Boolean, according to the spec, they aren't supported. So a Boolean wouldn't work when using the pure JavaScript version of IndexedDB either: https://www.w3.org/TR/IndexedDB/#key-construct