That package was created to cache some information, because nobody likes to wait for a http response. This package was designed to save small data, like user preferences, profile pictures and related names.
Due to privacy reasons, giostorage also provides an encrypted implementation. That is useful to keep way others users (or others unprivileged apps) from reading the content.
It's currently being used on WebAssembly, Windows and Android. It may work on Linux, Darwin and iOS, but it's not tested.
Known-Bug: You can't open files on Android before the gio initialize. So, you can't open
any file on func init(){}, for instance. The best idea is to open files on the first system.StageEvent.
Because you can't, in some OSes. It's not supported on WebAssembly. If WASM isn't a concern,
you can use os.Open, just fine. (: